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

Concept Questions :-

Self-inductance
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If all linear dimensions of an inductor are tripled, then self-inductance will become (keeping the total number of turns per unit length constant)

1.  3 times

2.  9 times

3.  27 times

4. 1/3 times

Concept Questions :-

Self-inductance
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A coil of resistance 20$\Omega$ and inductance 5H has been connected to a 200 V battery. The maximum energy stored in the coil is

(1) 250 J

(2) 125 J

(3) 500 J

(4) 100 J

Concept Questions :-

Self-inductance
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A coil has, 1,000 turns and 500 $c{m}^{2}$ as its area. The plane of the coil is placed at right angles to a magnetic induction field of . The coil is rotated through 180$°$ in 0.2. The average e.m.f. induced in the coil, in milli-volts, is

(1) 5

(2) 10

(3) 15

(4) 20

Concept Questions :-

Faraday 's law and lenz law
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Two coils have a mutual inductance of 5 mH. Current changes in the first coil according to the equation I = ${I}_{0}$cos wt, where ${I}_{0}$ = 10 A and  rad/s. Maximum value of e.m.f. induced in the second coil is

1.  5$\pi$ volt

2.   2$\pi$ volt

3.  4$\pi$ volt

4.  $\pi$ volt

Concept Questions :-

Mutual-inductance
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Lenz's law is a consequence of the law of conservation of

(1) Charge

(2) Momentum

(3) Mass

(4) Energy

Concept Questions :-

Faraday 's law and lenz law
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The magnetic flux through a circuit of resistance R changes by an amount $\Delta \phi$ in time $\Delta t$, Then the total quantity of electric charge Q, which passing during this time through any point of the circuit is given by

(1) $Q=\frac{\Delta \varphi }{\Delta t}$

(2) $Q=\frac{\Delta \varphi }{\Delta t}×R$

(3) $Q=-\frac{\Delta \varphi }{\Delta t}+R$

(4) $Q=\frac{\Delta \varphi }{R}$

Concept Questions :-

Faraday 's law and lenz law
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A metallic ring is attached to the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be

(1) First clockwise then anticlockwise

(2) In clockwise direction

(3) In anticlockwise direction

(4) First anticlockwise then clockwise

Concept Questions :-

Faraday 's law and lenz law
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A coil having an area A0 is placed in a magnetic field which changes from B0 to 4B0 in a time interval t. The e.m.f. induced in the coil will be

(1) $\frac{3{A}_{0}{B}_{0}}{t}$

(2) $\frac{4{A}_{0}{B}_{0}}{t}$

(3) $\frac{3{B}_{0}}{{A}_{0}t}$

(4) $\frac{4{B}_{0}}{{A}_{0}t}$

Concept Questions :-

Faraday 's law and lenz law
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A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet while it is passing through the ring is-

(1) Equal to that due to gravity

(2) Less than that due to gravity

(3) More than that due to gravity

(4) Depends on the diameter of the ring and the length of the magnet

Concept Questions :-

Faraday 's law and lenz law
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