If instantaneous current is given by \( \mathrm{P} \) \( \mathrm{i}...

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If instantaneous current is given by
\( \mathrm{P} \) \( \mathrm{i}=4 \cos (\omega \mathrm{t}+\phi) \) amperes, then the r.m.s. value of

W current is
(1) 4 amperes
(2) \( 2 \sqrt{2} \) amperes
(4) Zero amperes
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