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Question

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

A
500 sec ​
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B
20 sec ​
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C
35 milli sec ​
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D
1 milli sec ​
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Solution

The correct option is D 1 milli sec ​
Peak current in the circuits i0=126=2A
Current decreases from 2A to 1A i.e., becomes half in time
t=0.693LR=0.693×8.4×1036=1 millisec.

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