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Alternating Current Applied to an Inductor

A coil of 40 ...

Question

A coil of 40 henry inductance is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is : -

A

\frac{1}{5}

sec

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B

40 sec

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C

20 sec

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D

5 sec

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Solution

The correct option is D 5 sec
Time constant $= \frac{L}{R} = \frac{40}{8} = 5 s e c o n d s .$

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