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The time constant of an inductance coil ...

The time constant of an inductance coil is `2 xx 10^(-3) s`. When a `90 Omega` resistance is joined in series, the same constant becomes `0.5 xx 10^(-3) s`. The inductance and resistance of the coil are

A

`30 mH , 30 Omega`

B

`30mH, 60 Omega`

C

`60mH, 30 Omega`

D

`60 mH, 60 Omega`

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The correct Answer is:
c
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