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Q. No.Eddy currents can be minimised by:
1.
reducing relative motion between the core and magnet in an electric motor
2.
by making the core of thin laminations
3.
by increasing the conductor cross-sectional area
4.
both (1) and (2) are correct
Subtopic: Â Eddy Current |
 79%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | A bar magnet is dropped into a long vertical copper tube. Even taking air resistance as negligible, the magnet attains a constant terminal velocity. If the tube is heated, the terminal velocity gets increased. |
| Reason (R): | The terminal velocity does not depend on eddy current produced in copper tube. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Eddy Current |
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Given below are two statements:
A rectangular loop of resistance R is placed in a region where there is a magnetic field B, passing perpendicularly through the plane of the loop, as shown in the figure. The loop is pulled with a constant velocity v so that it is partially within the field.
A rectangular loop of resistance R is placed in a region where there is a magnetic field B, passing perpendicularly through the plane of the loop, as shown in the figure. The loop is pulled with a constant velocity v so that it is partially within the field.
| Assertion (A): | An external force F is needed to be applied in the direction of the velocity v so that the loop can move with constant velocity v. |
| Reason (R): | As the loop moves towards the right, the magnetic flux decreases inducing an emf and a corresponding current. This current causes a retarding force to be exerted on the wire. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Â Motional emf |
 65%
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Faraday's law of electromagnetic induction is a consequence of Biot-Savart law. |
| Reason (R): | Currents cause magnetic fields and interact with magnetic flux. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | (A) is true but (R) is false. |
| 2. | (A) is false but (R) is true. |
| 3. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
Subtopic: Â Faraday's Law & Lenz Law |
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Given below are two statements:
| Assertion (A): | Faraday's law of electromagnetic induction is not consistent with the law of conservation of energy. |
| Reason (R): | Lenz's law is consistent with energy conservation. |
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Subtopic: Â Faraday's Law & Lenz Law |
 66%
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Given below are two statements:
| Statement I: | The magnetic field due to a very long current-carrying solenoid, at its centre, is inversely proportional to the radius of the solenoid, other things remaining constant. |
| Statement II: | The magnetic energy stored in a solenoid carrying a current \(I\) is directly proportional to \(I^2.\) |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Â Self - Inductance |
 58%
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Match the quantities in List-I with their appropriate units in List-II.
| List-I | List-II |
| (a) inductance \(\times\) current | (i) V |
| (b) frequency \(\times\) capacitance | (ii) Wb |
| (c) frequency \(\times\) magnetic flux | (iii) \(\Omega^{-1}\) |
| (d) electric flux | (iv) V-m |
| 1. | a - (i), b - (iv), c - (ii), d - (iii) |
| 2. | a - (ii), b - (iii), c - (i), d - (iv) |
| 3. | a - (iii), b - (i), c - (ii), d - (iv) |
| 4. | a - (iii), b - (iv), c - (ii), d - (i) |
Subtopic: Â Self - Inductance |
 67%
From NCERT
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A rectangular loop and a circular loop are moving out of a uniform magnetic field region (as shown in the figure) to a field-free region with a constant velocity v. In which loop do you expect the induced emf to be constant during the passage out of the field region? The field is normal to the loops.
1. Only in the case of the rectangular loop
2. Only in the case of the circular loop
3. In both cases
4. None of these
Subtopic: Â Faraday's Law & Lenz Law |
 64%
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In a coil of resistance \(10\) \(\Omega\), the induced current developed by changing magnetic flux through it is shown in the figure as a function of time. The magnitude of change in flux through the coil in Weber is:
1. \(2\)
2. \(6\)
3. \(4\)
4. \(8\)
Subtopic: Â Magnetic Flux |
 67%
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AIPMT - 2012
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
| Assertion (A): | Lenz's law is in accordance with the conservation of energy. |
| Reason (R): | The amount of mechanical energy lost against the induced emf or current is equal to the electrical energy reappearing in the circuit. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Â Faraday's Law & Lenz Law |
 89%
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