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Q.

A solenoid has an inductance of 60 henry and a resistance of 30 ohm. If it connected to a 100 volt battery, how long will it take for the current to reach e−1e≈63.2% of its final value?

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a

1 second

b

2 second

c

e second

d

2e second

answer is B.

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Detailed Solution

I=I01−e−KLte−1eI0=I01−e−RLt or e−1ε=1−e−RLt or 1e=1eRLt or RLt=1 or t=LR=6030s=2s
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