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  4. A solenoid has an inductance of 60 henrys and a resistance of 30 ohms. If it is connected to a 100 volt battery, how long will it take for the current to reach (e-1/e) ≈ 63.2 % of its final value

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Q. A solenoid has an inductance of $60$ henrys and a resistance of $30$ ohms. If it is connected to a $100$ volt battery, how long will it take for the current to reach $\frac{e-1}{e} \approx 63.2 \%$ of its final value

Electromagnetic Induction

Solution:

$t=\tau=\frac{L}{R}=\frac{60}{30}=2\, s$