In the arrangement shown in given figure, current from A to B is increasing in magnitude. Induced current in the loop will:

1. have clockwise direction

2. have anticlockwise direction

3. be zero

4. oscillate between clockwise and anticlockwise

Subtopic:  Faraday's Law & Lenz Law |
 62%
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Two identical coaxial circular loops carry a current \(i\) each circulating in the same direction. If the loops approach each other:

1. the current in each will decrease
2. the current in each will increase
3. the current in each will remain the same
4. decrease

Subtopic:  Faraday's Law & Lenz Law |
 59%
From NCERT
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A rectangular coil of wire rotates about an axis which is perpendicular to a uniform magnetic field at a steady rate. Consider the instant when the plane of the coil is parallel to the magnetic field lines. At that instant the induced electromotive force is :

1. minimum

2. maximum

3. zero

4. constant at all times

Subtopic:  Motional emf |
 50%
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\(\mathrm A\) 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%
From NCERT
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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 |
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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 |
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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 |
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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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