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Questions  

A coil of inductance 8.4 mH and resistance 6 Ω is connected to a 12 V battery. The current in the coil is 1.0 A at approximately the time

a
500 s
b
20 s
c
35 ms
d
1 ms

detailed solution

Correct option is D

Peak current in the circuits, i0=126=2ACurrent decreases from 2 A to 1 A i.e., becomes half in time t=LRln 2=0.693×8.4×10−36=1 ms

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