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

Subtopic:  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

Subtopic:  Self - 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

Subtopic:  Faraday's Law & 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) $Q=\frac{\Delta \varphi }{R}$

Subtopic:  Faraday's Law & 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 and then anticlockwise.

2. in the clockwise direction.

3. in the anticlockwise direction.

4. first anticlockwise and then clockwise.

Subtopic:  Faraday's Law & 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) $\frac{4{B}_{0}}{{A}_{0}t}$

Subtopic:  Faraday's Law & 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

Subtopic:  Faraday's Law & Lenz Law |
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A magnet is brought towards a coil (i) speedily (ii) slowly then the induced e.m.f./induced charge will be respectively

(1) More in first case / More in the first case

(2) More in first case/Equal in both case

(3) Less in first case/More in second case

(4) Less in first case/Equal in both case

Subtopic:  Faraday's Law & Lenz Law |
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As shown in the figure, a magnet is moved with a fast speed towards a coil at rest. Due to this induced electromotive force, induced current and induced charge in the coil is E, I, and Q respectively. If the speed of the magnet is doubled, the incorrect statement is

(1) E increases

(2) I increases

(3) Q remains the same

(4) Q increases

Subtopic:  Faraday's Law & Lenz Law |
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A coil having 500 square loops each of the side 10 cm is placed normal to a magnetic field which increases at the rate of 1.0 tesla/second. The induced e.m.f. in volts is

(1) 0.1

(2) 0.5

(3) 1

(4) 5

Subtopic:  Faraday's Law & Lenz Law |
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