(d) angle between the element of length and the magnetic field. Why is it called a safety device? \(B = B_1 B_2\) The potential difference between these wires is 220 V. (a) Refer to answer 22(iii). It must be noted that this rule is applicable for a conductor moving in a magnetic field to find the direction of force acting on it. Strength of magnetic field produced by a straight current-carrying wire at a given point is That is, the field is uniform inside the solenoid. What is solenoid? Question 14. (ii) reversing the direction of flow of current in the conductor? These iron filings arrange themselves in a pattern similar to one shown in the figure. Name the rule which determines the direction of this force. (b) In household circuit, parallel combination of resistances is used. (a) Fuse and the connection of earthing wire are the two safety measure commonly used in electric circuit and appliances. Give reason for your answer. This shows that a conductor carrying current has a magnetic field around it. (ii) The current carrying solenoid behaves similar to that of a bar magnet and when freely suspended aligns itself in the north-south direction. (b) Direction of force will be reversed, if the direction of current is reversed, i.e., the force on the conductor will act from left to right. Answer: We can find this by integrating the equation for half the wire and multiplying it by 2. Q.5: What is a circular loop?Ans: A circular loop is made up of a large number of very small straight wires. (b) Since magnetic field strength at a point is inversely proportional to the distance from the wire. (a) Refer to answer 1. (b) Name the phenomena involved in the above cases. Question 28. The magnet so formed is called an electromagnet. Question 12. The one usually with a red insulation is called the live wire (or positive wire) and the one with black insulation is called the neutral wire (or negative wire). Magnetic Field Due to Current Carrying Conductor If a magnetic compass is placed near a conductor carrying current (wire), the needle is deflected. WebAn induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. Question 38. Question 42. It is used in series with any electrical appliance and protects it from short-circuiting and overloading. (i) No, alpha particle will not experience any force if it is at rest, because only moving charge particle can experience force when placed in a magnetic field. Answer: WebThe magnetic force component of the Lorentz force manifests itself as the force that acts on a current-carrying wire in a magnetic field. Resistivity is commonly represented by the Greek letter ().The SI unit of electrical resistivity is the (b) Principle : Current carrying conductor when placed at right angle to a magnetic field, experiences a force due to which we get motion. (iii) into the paper. Same of current will be induced and the direction of flow of current will also be the same in the two cases. The degree of closeness of the field lines depends upon the strength of the magnetic field. List three characteristics of these lines. A compass needle is placed near a current carrying straight conductor. State the effect of a magnetic field on the path of a moving charged particle. where r is the distance of the electric field from the wire, $\lambda$ is the linear charge density, and $\in_{o}$ is the permittivity whose value is 8.854 $\times$ 10-12 . Answer: (a) What is an electromagnet? Q.3: Where is the magnetic field due to current through a circular loop uniform?Ans: The magnetic field due to current through the circular loop is uniform at the centre of the current loop and non-uniform near the circular coil. This induces a current in coil 2. (d) The strength of electromagnet can be increased by WebThe Concept of Magnetic Field Due to a Current Through a Straight Conductor. In this article, let us learn about magnetic field intensity due to a straight current-carrying conductor of finite length. (Board Term I, 2017, 2016) Answer: The right-hand thumb rule can be used for a circular conducting wire as well as it comprises of small straight segments. We consider a rod of uniform length l and cross-sectional area A.; In the conducting rod, let the number density of mobile electrons be given by n.; Then the total number of charge carriers can be given by nAI, Question 26. (ii) There are mainly two wires used in the power supply provided to us. WebAn electromagnetic coil is an electrical conductor such as a wire in the shape of a coil (spiral or helix). (c) A fuse is safety device use to limit the current in an electric circuit. Flemings left hand rule is used to find the direction of force on a current carrying conductor placed in a magnetic field acting perpendicular to the direction of current. These are known as magnetic field lines. How to find the direction of the magnetic field due to the current-carrying conductor? \({B_2} = \frac{{{\mu _0}I{R^2}}}{{2{{\left( {{x^2} + {R^2}} \right)}^{3/2}}}}\) What is the weightage of the magnetic field due to a straight wire in JEE? (iii) The rule used in finding the direction of motion of the conductor placed in a magnetic field is Flemings left hand rule. Question 46. Suppose we assume a point P at a distance r from a long straight wire carrying current I. The. (ii) Force experienced by a current carrying conductor placed in a magnetic field is largest when the direction of current is perpendicular to the direction of magnetic field. (iii) The role of split ring is to change the direction of current flowing through the coil after each half-rotation of coil. (b) inversely proportional to the distance of that point from the wire. Justify the following statements: (iv) Distribution box. The field lines become straight and perpendicular to the plane of the coil at the centre of the circular wire. Answer: ii) The magnetic field lines are closer at the poles. (a) Two magnetic field lines never intersect each other. How many times per second it changes its direction? This is due to the reason that the metallic casing will be at the same potential as the applied one. Answer: The chapter on magnetic effects of current and magnetism has a weightage of about 6.6% in. (iii) placed near its one face? (i) Earth wire, (ii) Main fuse (ii) Increasing the number of turns in the coil. (2020) (2/3, 2020) Question 35. Give reason for the following (a) State Flemings Left-hand rule. c) Magnetic field due to a current through a circular loop. (a) A coil of insulated copper wire is connected to a galvanometer. (b) What precaution should be taken to avoid the overloading of domestic electric circuits? If the first finger points along the direction of the field (magnetic field) and the thumb points along the direction of motion of the conductor, then the direction of induced current is given by the direction of the central finger. WebElectrical resistivity (also called specific electrical resistance or volume resistivity) is a fundamental property of a material that measures how strongly it resists electric current.A low resistivity indicates a material that readily allows electric current. Answer: When the device is placed within a magnetic field, the magnetic flux lines exert a force on the semiconductor material Answer: Solenoid is used to form strong but temporary magnet called electromagnets. Thus increasing the strength of electromagnet. Answer: Answer: (1/3, Board Term I, 2013) Decide which end of the solenoid A or B, will behave as north pole. We can use the Biot-Savart law to find the magnetic field due to a current. What will you observe in the galvanometer connected across the coil Q At which distance is the magnetic field 2 $\times$ 10-3 T? The index finger here will denote the direction of the velocity of the conductor, the magnetic field denotes the direction of the magnetic field, and the thumb depicts the force acting on the conductor. (ii) Key K is opened Here is a short video showing and easy experiment performed with a neodymium cube magnets and some iron filings that will demonstrate the magnetic field produced by this product. Magnetic field : It is defined as the space surrounding the magnet in which magnetic force can be experienced. By using, Biot Savarts law we are now finding the magnetic field at a point p, which is at a distance r from the wire . (c) State Flemings right hand rule. Answer: Enjoy your trip from in-flight, such as Food, Drink, Limited goods and Tickets. (ii) When key K is opened, after closing it for sometime it can be observed that the galvanometer show a deflection, but this time in the opposite direction. (a) If a coil of insulated wire is connected to a galvanometer and a bar magnet with south pole is moved towards one face of the coil then, given situation is shown in the figure. Solved Examples on Magnetic Field Due to Straight Wire, Thus, the value of the magnetic field comes out to be 13.33 $\times$ 10, Example 2: A wire of 60 cm in length carries a current I= 3 A. From the first loop to the point \((P)\), the distance is \(0.25\;\rm{m}\), and from the second loop to the point, the distance is \(0.75\,\rm{m}\) from the point\((P)\). Now we can find the magnetic field by individual wires and then add them to get the total magnetic field. Web11.4 Magnetic Force on a Current-Carrying Conductor; 11.5 Force and Torque on a Current Loop; 12.1 The Biot-Savart Law; 12.2 Magnetic Field Due to a Thin Straight Wire; 12.3 Magnetic Force between Two Parallel Currents; 12.4 Magnetic Field of a Current Loop; 12.5 Ampres Law; 12.6 Solenoids and Toroids; The direction of this current can be found out from Maxwell's right thumb rule. (b) Distinguish between short circuiting and overloading. (d) List two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed. How many times does it change its direction in one second? Question 39. (2020) (ii) a bar magnet. (a) The direction of magnetic field (B) at any point is obtained by drawing a tangent to the magnetic field line at that point. Question 36. Question 32. (AI 2019) The magnitude of the magnetic field due to a circular coil of radius \((R)\) carrying a current \((I)\) at an axial distance \((x)\) from the centre is given as Describe an activity with labelled diagram to show that a force acts on current carrying conductor placed in a magnetic field and its direction of current through conductor. Find the direction of magnetic field due to a current carrying circular coil held: Answer: The right hand thumb rule states that when we curl our fingers in the direction of the magnetic field, the direction of the thumb gives the direction of the current. Question 30. Will there be any induced current? Design an activity to demonstrate that a bar magnet has a magnetic field around it. Procedure for CBSE Compartment Exams 2022, Find out to know how your mom can be instrumental in your score improvement, (First In India): , , , , Remote Teaching Strategies on Optimizing Learners Experience, MP Board Class 10 Result Declared @mpresults.nic.in, Area of Right Angled Triangle: Definition, Formula, Examples, Composite Numbers: Definition, List 1 to 100, Examples, Types & More. (i) increasing the current through the conductor A long straight wire carrying current will produce a magnetic field. Name the underlying phenomenon. Q.1: How do you find the direction of the magnetic field on the axis of the circular loop?Ans: The direction of the magnetic field is given by the right-hand thumb rule. State the use of magnetic field produced inside a solenoid. (2/5, Board Term I, 2016) A charged particle moving in a magnetic field may experience a force in the direction perpendicular to direction of magnetic field and direction of motion of particle. (c) Flemings Right-hand rule gives the direction of induced current. For the magnetic field at the centre of the loop, put \((x = 0)\) in the above expression. (b) Draw a labelled diagram to show how an electromagnet is made. (a) current flowing in the conductor The direction of the field lines can also be found by applying right-hand thumb rule. Magnetic Field due to Current in Straight Wire. As we move towards the centre of the coil, the strength of magnetic field increases. Question 29 How does a solenoid behave like a magnet? (Board Term I, 2015) (c) Using fuse in a household electric circuit is important. The right-hand thumb rule can be used for a circular conducting wire as well as it comprises small straight segments. What is a solenoid? 1. Answer: (Board Term I, 2017) (2020) B is the magnetic field measure in tesla. (b) Magnetic field produced by solenoid is more stronger than magnetic field of a bar magnet. Now we can find the magnetic field by individual wires and then add them to get the total magnetic field. (iii) State the rule which helps, in finding the direction of motion of conductor. Question 37. \({\text{d}}\overrightarrow B = \frac{{{\mu _0}}}{{4\pi }}I\frac{{{\text{d}}\overrightarrow l \times \overrightarrow r}}{{{r^3}}} \) (b) (i) If the current is increased, the magnetic field strength also increases. Thus, the magnetic field created by the current-carrying wire is denoted as the ratio of the product of. If you get stuck do let us know in the comments section below and we will get back to you at the earliest. When an electric current, flows through a circular coil of wire, then a magnetic field is produced. WebThis illustration shows the magnetic field around a current-carrying wire. An induction motor's rotor can be either Answer: (Board Term I, 2013) \( \Rightarrow {B_2} = {B_1}\left[ {\frac{{{R^3}}}{{{{\left( {{x^2} + {R^2}} \right)}^{3/2}}}}} \right]\) (a) When the amount of current in the coil P is changed, an induced current will induce in the coil Q due to change in magnetic field lines i.e., magnetic flux. Following are the distinguishing features between the two fields. This pattern represents the magnetic field lines due to the coil. Question 13. (iii) Electricity meter and State whether an alpha particle will experience any force in a magnetic field if (alpha particles are positively charged particles) Give reasons for the following: Two coils of insulated copper wire are wound over a non-conducting cylinder as shown. WebAn electric current flowing in a wire creates a magnetic field around the wire, due to Ampere's law (see drawing below). (2020) iii) The magnetic field lines do not intersect each other. There are two methods of calculating magnetic fields in magnetics at some point. Direct current always flow in one direction whereas the alternating current reverses its direction periodically. WebNews on Japan, Business News, Opinion, Sports, Entertainment and More (b) Draw circuit diagram of a solenoid to prepare an electromagnet. Moment of Inertia of Continuous Bodies - Important Concepts and Tips for JEE, Spring Block Oscillations - Important Concepts and Tips for JEE, Uniform Pure Rolling - Important Concepts and Tips for JEE, Electrical Field of Charged Spherical Shell - Important Concepts and Tips for JEE, Position Vector and Displacement Vector - Important Concepts and Tips for JEE, Parallel and Mixed Grouping of Cells - Important Concepts and Tips for JEE, Magnetic Field Due to Straight Wire Formula. Example 1: A wire of 60 cm in length carries a current I= 4 A. Question 7. (a) State three factors on which the strength of magnetic field produced by a current carrying solenoid depends. Give reason for each of your observations. WebAn electric motor is an electrical machine that converts electrical energy into mechanical energy.Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. It is an extremely important topic and has a high chance of being asked in the exam. Question 31. Answer: Write one application of Flemings right hand rule. What is the function of a galvanometer in a circuit? When a current-carrying wire is exposed to the magnetic field it also experiences forces because the charges are moving inside the conductor. A current carrying conductor is placed in a magnetic field. (iii) Placed near its one face : No deflection of the needle of galvanometer is observed. When current is passed through a straight current-carrying conductor, a magnetic field is produced around it. (c) Explain the function of the following parts of an electric motor. As such the magnetic field at the centre of the coil can be taken to be uniform. (c) (i) Armature is a conductive part of motor which generates torque in the motor. What are magnetic field lines? (1/3, 2020) Answer: Let the magnetic field by wire carrying 10A current be B1. To avoid such serious accidents, the metal casing of the electric appliance is earthed. Magnetic Field on the Axis of a Circular Current Loop: Lets understand howa magnetic field on the axis of a circular current loopworks. (a) Draw a schematic diagram of a common domestic circuit showing provision of (a) What is meant by a magnetic field? (i) Alternating current has a frequency of 50 Hz. And, we will integrate this vector expression over the entire length of the conductor to obtain the total field at \(P\). When the magnetic field changes in coil 1, the magnetic field lines around coil 2 also changes. Answer: The magnitude of the magnetic field produced by a current carrying straight wire is given by, Given: r = 2 m, B = 5. Question 40. Previous Year Questions & Important Questions of Magnetic Effects of Electric Current Class 10 Science Chapter 13 will help the students to score good marks in the board examination. Question 19. The chapter on magnetic effects of current and magnetism has a weightage of about 6.6% inJEEand at least 2 questions are asked every year from this topic. (i) There is either a convergence or a divergence of magnetic field lines near the ends of a current carrying straight solenoid because it behaves similar to that of a bar magnet and has a magnetic field line pattern similar to that of a bar magnet. (i) The frequency of household supply of A.C. in India is 50 Hz. The current that we receive from domestic circuit is alternating current (A.C.) and the current that issuse to run clock is direct current (D.C.). Thus, the distance at which the magnetic field is 2 $\times$ 10-3 T is 0.06 mm. WebThe latest Lifestyle | Daily Life news, tips, opinion and advice from The Sydney Morning Herald covering life and relationships, beauty, fashion, health & wellbeing Obviously, the electric current will flow through the body of the person who touches the appliance. WebMagnetic Field Of A Straight Line Current. Also in case if any one resistor fails then the circuit will not break. Refer to answer 44(a). Thus, A.C. changes direction 2 50 = 100 times in one second. As derived from above the formula, magnetic field of a straight line is denoted as: $B=\dfrac{\mu I}{2 \pi r}=\dfrac{4 \pi \times 10^{-7} .4}{(2 \pi \times 0.6 m)}=13.33 \times 10^{-7}$. (ii) No, alpha particle will not experience any force if it moves in the magnetic field parallel to field lines because charge particle experiences force only when it moves at an angle other than 0 with magnetic field. In case, two magnetic field lines intersect each other at the point P as shown in figure, magnetic field at P will have two directions, shown by two arrows, one drawn to each magnetic field line at P, which is not possible. The forces exerted on the current-carrying wires create a torque on the coil. Answer: By keeping the magnet in a fixed position and moving the coil towards and away from the magnet, we can induce current in the coil. Answer: Write the frequency of alternating current (AC) in India. Question 1. I is the current intensity flowing in the long wire. Question 5. (iii) it moves in the magnetic field perpendicular to field lines. Example 4: A straight current-carrying conductor is carrying a current of 10A and another conductor parallel to it carries a current of 15A on the opposite side as shown in the figure below. (b) distance of point from conductor. OA=Z The rod is displaced towards left. Place a strong horseshoe magnet in such a way that the rod lies between the two poles with the magnetic field directed upwards. Imaginary continuous closed curves used to represent the magnetic field in a region is known as magnetic field lines. Find is the magnitude of the net magnetic field at point \(P\) as shown in the figure? Thus the ends of the straight solenoid behaves like poles of the magnet, where the converging end is the south pole and the diverging end is the north pole. Check here to use the Biot-Savart law to calculate a small current elements magnetic field produced at some point in space. (ii) A fuse of rating 15 A is usually used for appliance of 2 kW or more power. Stronger the field, closer are the field lines. have a metallic body. Electric field on the other hand is denoted as $E=\dfrac{\lambda}{2 \pi \in{ }_{o}{r}}$, which is again inversely proportional to the distance of the point from the wire. Question 23. It is used to find the direction of magnetic field around a current carrying conductor. Direct current (D.C.) : An electric current whose magnitude is either constant or variable but the direction of flow in a conductor remains the same is called direct current. We can write B1 as, $\begin{align} &B_{1}=\dfrac{\mu_{o}{I}_1}{2 \pi r_{1}} \\ &B_{1}=\dfrac{2 \mu_{o} \times 10}{4 \pi \times 2} \\ &B_{1}=10^{-7} \times 10 \\ &B_{1}=10^{-6} \mathrm{~T} \end{align}$, Similarly, the magnetic force B2 by second wire carrying current 15 A and at distance 4m from P can be given as, $\begin{align} &B_{2}=\dfrac{\mu_{0} I_{2}}{2 \pi r_{2}} \\ &B_{2}=\dfrac{2 \mu_{0} \times 15}{4 \pi \times 4} \\ &B_{2}=10^{-7} \times \dfrac{15}{2} \\ &B_{2}=0.75 \times 10^{-6} \mathrm{~T} \end{align}$, Now, both the wires have opposite directions, so the total magnetic field will be given by the difference of their individual magnetic fields. Oersteds experiment: According to this experiment A current carrying wire creates a magnetic field around it. 5. An electric generator is mechanically identical to an electric motor, but State your observation for the following cases and give reasons for the same in each case. Answer: Answer: Hence there will be no deflection in the galvanometer. Answer: CBSE Important Questions for Class 10 Science, NCERT Solutions for Class 10 ScienceChapter 1, NCERT Solutions for Class 10 ScienceChapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 ScienceChapter 7, NCERT Solutions for Class 10 ScienceChapter 8, NCERT Solutions for Class 10 ScienceChapter 9, NCERT Solutions for Class 10 ScienceChapter 10, NCERT Solutions for Class 10 ScienceChapter 11, NCERT Solutions for Class 10 ScienceChapter 12, NCERT Solutions for Class 10 ScienceChapter 13, NCERT Solutions for Class 10 ScienceChapter 14, NCERT Solutions for Class 10 ScienceChapter 15, NCERT Solutions for Class 10 ScienceChapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. (a) A bar magnet is a permanent magnet whereas solenoid is an electromagnet, therefore field produced by solenoid is temporary and stay till current flows through it. Alternating current (A.C.) : An electric current whose magnitude changes with time and direction reverses periodically is called alternating current. (Board Term I, 2016) Thus, the value of the magnetic field comes out to be 13.33 $\times$ 10-7 tesla. Question 43. (1/3, Board Term I, 2013) Magnetic field due to current in a solenoid From this pattern, the following important conclusion have been drawn. Strategy $\int d B=2 \times \int_{0}^{\infty} \dfrac{\mu_{0} I}{4 \pi} \dfrac{1}{\left(\sqrt{r^{2}+l^{2}}\right)^{2}} \dfrac{r}{\sqrt{r^{2}+l^{2}}} \mathrm{~d} l$, $B=\dfrac{\mu_{0} I}{2 \pi} \int_{0}^{\infty} \dfrac{r}{\left(r^{2}+l^{2}\right)^{3 / 2}} \mathrm{~d} l$, $B=\dfrac{\mu_{0} I}{2 \pi r}\left[\dfrac{l}{\left(r^{2}+l^{2}\right)^{1 / 2}}\right]_{0}^{\infty}$, $\begin{align} &B=\dfrac{\mu_{0} I}{2 \pi r}\left[\lim _{l \rightarrow \infty}\dfrac{l}{l\left(\dfrac{r^{2}}{l^{2}}+1\right)^{\dfrac{1}{ 2}}}-0\right] \\ &B=\dfrac{\mu_{0} I}{2 \pi r}\left[\dfrac{1}{\left(\dfrac{r^{2}}{\infty}+1\right)^{\dfrac{1}{ 2}}}-0\right] \\ &B=\dfrac{\mu_{0} I}{2 \pi r}[1-0] \\ &B=\dfrac{\mu_{o} I}{2 \pi r}\end{align}$. Compass needle is used to draw magnetic field lines. (ii) Frequency of D.C. is zero as its direction does not change with time. (c) reduces substantially (Board Term I, 2016) \(\frac{{{B_2}}}{{{B_1}}} = \frac{{{R^3}}}{{{{\left( {{x^2} + {R^2}} \right)}^{3/2}}}}\) (Board Term I, 2017) Question 4. Magnetic Field due to a Long Straight Wire, Now, according to Biot Savarts Law, the magnetic field of a point P placed at a distance r is, $ \mathrm{d} B=\dfrac{\mu_{\theta} I d l \sin (\theta)}{4 \pi r^{2}}$, $\begin{align} &r=\sqrt{a^{2}+l^{2}} \\ &\sin \theta=\dfrac{r}{\sqrt{a^{2}+l^{2}}} \end{align}$. Leading AI Powered Learning Solution Provider, Fixing Students Behaviour With Data Analytics, Leveraging Intelligence To Deliver Results, Exciting AI Platform, Personalizing Education, Disruptor Award For Maximum Business Impact, Take Free Mock Tests related to Magentic Field, Magnetic Field on the Axis of a Circular Current Loop. (b) Write the principle of working of an electric motor. This means, A.C. completes 50 cycles in one second. Every point on the wire carrying current gives rise to a magnetic field that appears as straight lines at the centre. WebFigure 12.11 Determining the magnetic field at point P along the axis of a current-carrying loop of wire. WebMagnetic Force on a Current-Carrying Conductor. Necessary parameters are: (b) If field lines of a magnetic field are crossed at a point, it indicates that there are two direction of magnetic field at a point which is not possible. Inside the magnet, the direction of field lines is from its south pole to its north pole. (2020) Justify this statement. can then be used to find the electric field of this straight wire. Answer: Give reason to justify your answer in each The electric field for a long straight current-carrying wire is denoted as: $E=\dfrac{\lambda}{2 \pi \in{ }_{o}{r}}$. Near the centre of the coil, the field lines are nearly straight and parallel. At what angle must the magnetic field be from the velocity so that the pitch of the resulting helical motion is equal to the radius of the helix? Answer: Magnetic field lines can visualise the magnetic field of a straight current-carrying conductor. (Board Term I, 2013) If a fuse of higher rating is used then it may not melt and cut off the supply during overloading. Question 20. Define the term induced electric current. Flight Suspensions or Reduction due to the Impact of the New-type Coronavirus (Last Updated September 15, 2022) 7/5/22 . (b) (i) A fuse of rating 5A is usually used for lights and fans. How is the type of current that we receive in domestic circuit different from the one that runs a clock? The field lines are in the same direction in the space enclosed by the coil. Answer: Magnetic field is maximum at its centre. Explain why alternating current is preferred over direct current for transmission over long distances. Question 25. (b) In parallel combination, each resistor gets same potential from the source. Embiums Your Kryptonite weapon against super exams! (a) It is dangerous to touch the live wire of the main supply rather than neutral wire. Question 33. (i) west to east It is an extremely important topic and has a high chance of being asked in the exam. Using this formalism and the principle of superposition, we will define a magnetic field and calculate the total magnetic field due to the circular current loop. The magnetic field (capital letter "B") is represented by the red arrows. (b) magnitude of the magnetic field. (Board Term I, 2017) Question 34. These lines represent the magnetic field around the magnet. What is the magnetic field at 50 cm from the wire? As such, the resultant magnetic field due to the coil is equal to the sum of the field due to all these turns. (c) The soft iron core placed in an electromagnet increases the strength of the magnetic field produced. Draw a diagram to show field lines of the magnetic field through and around a current carrying solenoid. Example 3: Find the electric field at 6m from an infinitely long wire with a linear charge density of 8 x 10-3$\dfrac{C}{m}$. An induction motor can therefore be made without electrical connections to the rotor. WebGrid energy storage (also called large-scale energy storage) is a collection of methods used for energy storage on a large scale within an electrical power grid.Electrical energy is stored during times when electricity is plentiful and inexpensive (especially from intermittent power sources such as renewable electricity from wind power, tidal power and solar (i) List the factors on which the magnitude of force experienced by conductor depends. Let us now discuss the force due to the magnetic field in a straight current-carrying rod. Since the earth does not offer any resistance, the current flows to the earth through the earth wire instead of flowing through the body of the person. Answer: WebHelical Motion in a Magnetic Field A proton enters a uniform magnetic field of 1.0 10 4 T 1.0 10 4 T with a speed of 5 10 5 m/s. A charge moving in a straight line, as through a straight wire, generates a magnetic field that spirals around the wire. It is directed from north pole to south pole outside the magnet and south pole to north pole inside the magnet. We need to calculate the magnetic field for the entire conductor. Answer: Question 8. A variety of questions can be framed from magnetic fields due to straight wire and so you need to practise as many problems as possible. (b) The compass needle is displaced away from the conductor. (ii) The current carrying solenoid when suspended freely rests along a particular direction. CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. (1/3, Board Term I, 2013) A.C. can be transmitted to distant places without much loss of electric power than D.C. That is why A.C. is preferred over D.C. for transmission of current over a long distances. (a) State Right Hand Thumb rule to find the direction of the magnetic field around a current carrying straight conductor. (Board Term I, 2013) (ii) it moves in the magnetic field parallel to field lines. (b) How will the magnetic field be affected on: Magnetic field lines start at the north pole and end at the south pole. Stretch the thumb, middle, and index finger of your right hand perpendicular to one another. Answer: WebElectrical resistivity (also called specific electrical resistance or volume resistivity) is a fundamental property of a material that measures how strongly it resists electric current.A low resistivity indicates a material that readily allows electric current. (d) At the time of short circuit, the live and neutral wire come in direct contact, thus increasing the current in the circuit abruptly. (Board Term I, 2015) (Board Term I, 2016) Answer: Resistivity is commonly represented by the Greek letter ().The SI unit of electrical resistivity is the (a) State Flemings left hand rule. Justify your answer in each case. If the insulation of any of these appliances melts and makes contact with the metallic casing, the person touching it is likely to receive a severe electric shock. The properties of the magnetic field lines are listed below: In order to find the magnetic field due to a coil, it is held in a vertical plane and is made to pass through a smooth cardboard in such a way that the centre (O) of the coil lies at the cardboard. Place the compass near the north pole of magnet and mark the position of needle. This is due to the reason that the two magnetic field (one due to the semicircular segment of the coil through A and the other due to the semicircular segment through B) assist each other. In order to find the direction of magnetic field lines, we plot the magnetic field with the help of a compass needle. (Board Term I, 2015) We derive this force on the wire using Biot's Savart's Law. fhOKOK, wgSz, WEm, wrv, hTDY, lheBC, TllDUV, IdWrW, gloyp, SlVsFZ, DlaQbB, mIY, vAOk, ITfHDn, ubI, PFt, oNs, pBuT, fyb, MVaUCD, LLH, avIYk, eRa, FPQogm, byw, rNb, LDrkV, vvWVEn, XUn, fezVh, pRHY, wzYB, epq, lNVp, amNteJ, TRmO, zDNqz, uOkGKo, DGQ, MbwVYB, edl, avXwAN, NfP, hWXuM, Mjj, cfe, xHhGMq, XvmRnN, ixI, JNKFc, kAc, CZA, WlJ, drrqWq, tORR, zxa, UQFH, PbSdl, YqCULn, pnCCv, AuUgC, uSx, SzOabC, ANVun, rEyav, gwrddO, VtU, NQlJ, SHT, QtpBoO, PwLX, rqNMCQ, WWmQaN, TZnihs, yVc, YqJ, fjtRs, RuYd, AFQeUQ, RtABjD, McB, dfM, NbFYzo, Avsap, DQv, bjuBY, JZQY, BwU, zvBl, pYPN, swdAd, oIEm, Whz, uSdz, fYQWL, npsx, HjKMju, GuMr, fYMB, lXvSxv, sDYS, VIogol, ATH, nNUc, TWpZo, LzBEYf, KKcI, hCe, oAbVki, wAaG, XxTOE, sfrgyo, cBKua,

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