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An inductor coil stores energy U when a ...

An inductor coil stores energy U when a current I is passed through it and dissipates energy at the rate of P. The time constant of the circuit when this coil is connected across a battery of zero internal resistance is

A

`(4U)/P`

B

`U/P`

C

`(2U)/P`

D

`(2P)/U`

Text Solution

Verified by Experts

The correct Answer is:
C
`U=1/2Ll^(2) rArr P=I^(2)R` or `(2U)/P=L/R=tau`.
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