The net magnetic flux through any closed surface, kept in uniform magnetic field is:

1. Zero

2. μ04π

3. 4πμ0

4. 4μ0π

Subtopic:  Magnetic Flux |
 94%
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If a current is passed through a circular loop of radius R then magnetic flux through a coplanar square loop of side l as shown in the figure (l<<R) is:

 

1. μ0l2R2l

2. μ0Il22R

3. μ0lπR22l

4. μ0πR2Il

Subtopic:  Magnetic Flux |
 82%
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The dimensions of inductance are:

1. [MLT-2A-2]
2. [ML2T-2A2]
3. [ML2T-2A-1]
4. [ML2T-2A-2]

Subtopic:  Self - Inductance |
 69%
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The radius of a loop as shown in the figure is \(10~\mathrm {cm}.\) If the magnetic field is uniform and has a value \(10^{-2}~ T,\) then the flux through the loop will be:
 

1. \(2 \pi \times 10^{-2}Wb\) 2. \(3 \pi \times 10^{-4}Wb\)
3. \(5 \pi \times 10^{-5}Wb\) 4. \(5 \pi \times 10^{-4}Wb\)
Subtopic:  Magnetic Flux |
 77%
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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): Self-inductance is called the inertia of electricity.
Reason (R): It is on account of self-inductance that the coil opposes any change in current passing through it. 

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:  Self - Inductance |
 86%
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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): When a piece of non-metal and a metal are dropped from the same height near the surface of the earth, the non-metallic piece will reach the ground first.
Reason (R): Induced current in metal will decrease the acceleration.


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:  Motional emf |
 84%
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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%
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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%
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The current through a choke coil increases from zero to 6 A in 0.3 seconds and an induced emf of 30 V is produced. The inductance of the coil is:

1. 5 H 2. 2.5 H
3. 1.5 H 4. 2 H
Subtopic:  Self - Inductance |
 89%
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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 |
 81%
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