A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is:

1. Twice per revolution 2. Four times per revolution
3. Six times per revolution 4. Once per revolution

Subtopic:  Faraday's Law & Lenz Law |
 73%
From NCERT
AIPMT - 2013
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The current I in an inductance coil varies with time t according to the graph shown in the figure. Which one of the following plots shows the variation of voltage in the coil with time?

1.  2.
3. 4.
 

Subtopic:  Self - Inductance |
 80%
From NCERT
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A bar magnet is released along the vertical axis of the conducting coil. The acceleration of the bar magnet is:

1. greater than g. 2. less than g.
3. equal to g. 4. zero.
Subtopic:  Faraday's Law & Lenz Law |
 85%
From NCERT
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A rod having length l and resistance R0 is moving with speed v as shown in the figure. The current through the rod is:
               
1. BlvR1R2R1+R2+R0

2. Blv1R1+1R2+1Ro2

3. BlvR1+R2+R0

4. Blv1R1+1R2+1R0

Subtopic:  Motional emf |
 65%
From NCERT
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A solenoid of inductance L and resistance R is connected to a battery of e.m.f. E. Maximum value of magnetic energy stored in the inductor is:

1. E22R
2. E2L2R2
3. E2LR 
4. E2L2R

Subtopic:  LR circuit |
 82%
From NCERT
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The coefficient of mutual inductance between two coils depends upon:

1. medium between coils
2. separation between coils
3. orientation of coils
4. All of these

Subtopic:  Mutual Inductance |
 86%
From NCERT
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A small square loop of wire of side 'l' is placed inside a large square loop of side 'L' (Ll). If the loops are coplanar and their centres coincide, the mutual inductance of the system is directly proportional to:

1. L/l

2. l/L

3. L2/l

4. l2/L

Subtopic:  Mutual Inductance |
 71%
From NCERT
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Two coils have a mutual inductance of 5 mH. The current changes in the first coil according to the equation \(I=I_{0}cos\omega t,\) where \(I_{0}=10~A\) and ω = 100π rad/s. The maximum value of e.m.f. induced in the second coil is:

1. 5π Volt

2. 2π Volt

3. 4π Volt

4. π Volt

Subtopic:  Mutual Inductance |
 80%
From NCERT
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Eddy currents are used in:

1. Induction furnace

2. Electromagnetic brakes

3. Speedometers

4. All of these

Subtopic:  Eddy Current |
 94%
From NCERT
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The magnetic flux linked with a coil varies with time as \(\phi = 2t^2-6t+5,\) where \(\phi \) is in Weber and \(t\) is in seconds. The induced current is zero at:
1. \(t=0\)
2. \(t= 1.5~\text{s}\)
3. \(t=3~\text{s}\)
4. \(t=5~\text{s}\)

Subtopic:  Faraday's Law & Lenz Law |
 90%
From NCERT
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