\(\mathrm A\) and \(\mathrm B\) are two metallic rings placed at opposite sides of an infinitely long straight conducting wire as shown. If current in the wire is slowly decreased, the direction of the induced current will be:

   

1. clockwise in \(\mathrm A\) and anticlockwise in \(\mathrm B\).
2. anticlockwise in \(\mathrm A\) and clockwise in \(\mathrm B\).
3. clockwise in both \(\mathrm A\) and \(\mathrm B\).
4. anticlockwise in both \(\mathrm A\) and \(\mathrm B\).

Subtopic:  Faraday's Law & Lenz Law |
 72%
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A metal disc rotates freely, between the poles of a magnet in the direction indicated. Brushes P and Q makes contact with the edge of the disc and the metal axle. What current, if any, flows through R?

 

1. A current from P to Q

2. a current from Q to P

3. no current, because the emf in the disc is opposed by the back emf

4. no current,because the emf induced in one side of the disc is opposed by the emf induced in the other side.

 

Subtopic:  Motional emf |
From NCERT
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Two identical inductance currents  vary with time according to linear laws (as shown in figure). In which of two inductances is the self induction emf greater?

   

1. 1

2. 2

3. same

4. data are insufficient to decide

Subtopic:  Self - Inductance |
 56%
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Figure shows a uniform magnetic field B confined to a cylindrical volume and is increasing at a constant rate. The instantaneous acceleration experienced by an electron placed at P is:

     Induced emf

1. zero

2. towards right

3. towards left

4. upwards

Subtopic:  Faraday's Law & Lenz Law |
From NCERT
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A conducting wire frame is placed in a magnetic field which is directed into the plane of the paper (see figure). The magnetic field is increasing at a constant rate. The directions of induced currents in wires AB and CD are

1. B to A and D to C

2. A to B and C to D

3. A to B and D to C

4. B to A and C to D

Subtopic:  Faraday's Law & Lenz Law |
 71%
From NCERT
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Two identical conductors P and Q are placed on two frictionless (conducting) rails R and S in a uniform magnetic field directed into the plane. If P is moved in the direction as shown in the figure with a constant speed, then rod Q:

1. will be attracted toward P
2. will be repelled away from P
3. will remain stationary
4. maybe repelled or attracted towards P

Subtopic:  Motional emf |
From NCERT
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Two circular coils A and B are facing each other as shown in figure. The current i through A can be altered. Then-

 

1. there will repulsion between A and B if i is increased

2. there will be attraction between A and B if i is increased

3. there will be neither attraction nor repulsion when i is changed

4. attraction or repulsion between A and B depends on the direction of current. It does not depend whether the current is increased or decreased.

Subtopic:  Faraday's Law & Lenz Law |
 58%
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The e.m.f. induced in a coil of wire, which is rotating in a magnetic field, does not depend on:

1. the angular speed of rotation

2. the area of the coil

3. the number of turns on the coil

4. the resistance of the coil

Subtopic:  Motional emf |
 77%
From NCERT
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A bar magnet is moved along the axis of copper ring placed far away from the magnet. Looking from the side of the magnet, an anticlockwise current is found to be induced in the ring. Which of the following may be true?

1. The south pole faces the ring and the magnet moves towards it.

2. The north pole faces the ring and the magnet moves towards it.

3. The north pole faces the ring and the magnet moves away from it.

4. None of the above

Subtopic:  Faraday's Law & Lenz Law |
 70%
From NCERT
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For L-R circuit, the time constant is equal to:

1. twice the ratio of the energy stored in the magnetic field to the rate of the dissipation of energy in the resistance.

2. the ratio of the energy stored in the magnetic field to the rate of dissipation of energy in the resistance.

3. half of the ratio of the energy stored in the magnetic field to the rate of dissipation of energy in the resistance.

4. square of the ratio of the energy stored in the magnetic field to the rate of dissipation of energy in the resistance.

Subtopic:  LR circuit |
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