A one-metre long metallic rod is rotated with an angular frequency of 400 radians/sec about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallic ring. A constant uniform magnetic field of 0.5 tesla parallel to the axis exists everywhere. The emf developed between the centre and the ring is

1. 200 V

2. 100 V

3. 50 V

4. 1000 V

Subtopic:  Motional emf |
 77%
From NCERT
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Self-inductances of primary and secondary of an ideal transformer are 90 mH and 40 mH. If the current in the primary decreases at the rate 103 As-1, then emf across the secondary is

1. 40 V

2. 90 V

3. 60 V

4. 20 V

Subtopic:  Mutual Inductance |
 60%
From NCERT
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A short magnet is allowed to fall along the axis of a horizontal metallic ring. Starting from rest, the distance fallen by the magnet in one second may be:

1. 4 m

2. 5 m

3. 6 m

4. 7 m

Subtopic:  Motional emf |
 61%
From NCERT
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In the figure as shown, straight wire carries a constant current. The direction of induced current in the rotating loop about an axis xx' at the instant shown

1. is anticlockwise.

2. is clockwise.

3. there is no current in the loop.

4. maybe clockwise or anticlockwise.

Subtopic:  Motional emf |
From NCERT
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The figure shows a circular region of radius R in which uniform magnetic field is increasing at a constant rate dB/dt = α. The induced electric field at a distance r from the centre is

1. αr2 for all values of r

2. αR22r for all values of r

3. αr2 for r>R and αR22r for r<R

4. αr2for r<R and αR22r for r>R

Subtopic:  Motional emf |
 60%
From NCERT
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If the instantaneous charge in the capacitor is 400μC and current through the circuit is decreasing at the rate 103 A/s, then potential difference VA-VB is equal to

1. 30 V

2. Zero

3. 10 V

4. 70 V

Subtopic:  Self - Inductance |
 58%
From NCERT
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A uniform rod rotates in a uniform magnetic field B (perpendicular to its length) about its one of the end with constant angular velocity. The electric field produced is

1. Uniform along its length

2. Non-uniform along its length

3. May be uniform or non-uniform

4. Cannot be predicted

Subtopic:  Motional emf |
 51%
From NCERT
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When the current in a coil changes from 0 to 5 A, in 0.5 s, the average induced emf in the coil is 1 volt. The self-inductance of the coil is

1. 0.1H

2. 0.2H

3. 0.4H

4. 1.5H

Subtopic:  Self - Inductance |
 87%
From NCERT
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The magnetic flux linked with a coil varies with time as ϕ = 2t2-6t+5, where ϕ is in weber and t is in seconds. The induced current is zero at:

1. t = 0

2. t = 1.5 s

3. t = 3 s

4. t = 5 s

Subtopic:  Faraday's Law & Lenz Law |
 90%
From NCERT
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Choke coil works on the principle of

1. Kirchhoff's law

2. Self-induction

3. Mutual induction

4. All of these

Subtopic:  Self - Inductance |
 59%
From NCERT
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