A resistance of \( 20 \mathrm{ohms} \) is connected to a source of an alternating potential \( V...

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A resistance of \( 20 \mathrm{ohms} \) is connected to a source of an alternating potential \( V=220 \sin (100 \pi t) \). The time taken by the current to change from its peak value to \( r . m . s \) value is
[MP PET 2001]
(a) \( 0.2 \mathrm{sec} \)
(b) \( 0.25 \mathrm{sec} \)
(c) \( 25 \times 10^{-3} \mathrm{sec} \)
(d) \( 2.5 \times 10^{-3} \mathrm{sec} \)
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