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A source of an alternating potential V =...

A source of an alternating potential V = 200 sin `(100 pit)` V is connected with a resistance of `20Omega` Time taken by current to change from its peak value to rms value is:

A

0.52 s

B

`25 xx10^(-3) s`

C

0.2 s

D

`2.5 xx10^(-3) s`

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