# The inductance of a coil is 60μH. A current in this coil increases from 1.0 A to 1.5 A in 0.1 second. The magnitude of the induced e.m.f. is  (1) 60 × 10–6 V (2) 300 × 10–4 V (3) 30 × 10–4 V (4) 3 × 10–4 V

Subtopic:  Self - Inductance |
82%
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The self inductance of a coil is L. Keeping the length and area same, the number of turns in the coil is increased to four times. The self inductance of the coil will now be

(1) $\frac{1}{4}L$

(2) L

(3) 4 L

(4) 16 L

Subtopic:  Self - Inductance |
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A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is

(1) 3.5 sec

(2) 4.0 sec

(3) 4.5 sec

(4) 5.0 sec

Subtopic:  LR circuit |
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Pure inductance of 3.0 H is connected as shown below. The equivalent inductance of the circuit is

(1) 1 H

(2) 2 H

(3) 3 H

(4) 9 H

Subtopic:  Self - Inductance |
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If a current of 10 A flows in one second through a coil, and the induced e.m.f. is 10 V, then the self-inductance of the coil is

(1) $\frac{2}{5}H$

(2) $\frac{4}{5}H$

(3) $\frac{5}{4}H$

(4) 1 H

Subtopic:  Self - Inductance |
94%
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The adjoining figure shows two bulbs $$B_1$$ and $$B_2$$ resistor $$R$$ and an inductor $$L$$. When the switch $$S$$ is turned off

 1 Both $$B_1$$ and $$B_2$$ die out promptly. 2 Both $$B_1$$ and $$B_2$$ die out with some delay. 3 $$B_1$$ dies out promptly but $$B_2$$ with some delay. 4 $$B_2$$ dies out promptly but $$B_1$$ with some delay.
Subtopic:  Self - Inductance |
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An inductance L and a resistance R are first connected to a battery. After some time the battery is disconnected but L and R remain connected in a closed circuit. Then the current reduces to 37% of its initial value in time ?

(1) RL sec

(2) $\frac{R}{L}sec$

(3) $\frac{L}{R}sec$

(4) $\frac{1}{LR}sec$

Subtopic:  LR circuit |
78%
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In an LR-circuit, the time constant is that time in which current grows from zero to the value (where I0 is the steady-state current)

(1) 0.63 I0

(2) 0.50 I0

(3) 0.37 I0

(4) I0

Subtopic:  LR circuit |
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In the figure magnetic energy stored in the coil is

(1) Zero

(2) Infinite

(3) 25 joules

(4) None of the above

Subtopic:  Self - Inductance |
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A copper rod of length l is rotated about one end perpendicular to the magnetic field B with constant angular velocity ω. The induced e.m.f. between the two ends is

(1) $\frac{1}{2}B\omega {l}^{2}$

(2) $\frac{3}{4}B\omega {l}^{2}$

(3) $B\omega {l}^{2}$

(4) $2B\omega {l}^{2}$

Subtopic:  Motional emf |
89%
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