A resistance of \( 20 \Omega \) is connected to a source of an P alternating potential \( \mathr...

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A resistance of \( 20 \Omega \) is connected to a source of an
P alternating potential \( \mathrm{V}=220 \sin (100 \pi t) \). The time

W taken by the current to change from the peak value to rms value, is
(1) \( 0.2 \mathrm{~s} \)
(2) \( 0.25 \mathrm{~s} \)
(3) \( 2.5 \times 10^{-2} \mathrm{~s} \)
(4) \( 2.5 \times 10^{-3} \mathrm{~s} \)
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