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Q.

An inductor (L = 100 mH) a resistor (R = 100 Ω)and a battery (E = 100 V) are initially connected in series as shown in the Fig. 9.89. After a long time the battery is disconnected after  short circuiting the points A and  B. The current in the circuit 1 ms after the short circuit is :

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a

1/e A

b

e A

c

0.1 A

d

1 A

answer is A.

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Detailed Solution

Long time after, current in the circuitI0=ER=1 AOn short-circuitingI=I0e-RLt=(1)e-100100 x 10-3 x 10-3=1eA
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