The current flowing through an ac circuit is given by \( \mathrm{P}...

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The current flowing through an ac circuit is given by
\( \mathrm{P} \)
\( l=5 \sin (120 \pi t) \mathrm{A} \). How long will the current take to
W
reach the peak value starting from zero?
(1) \( \frac{1}{60} \mathrm{~s} \)
(2) \( 60 \mathrm{~s} \)
(3) \( \frac{1}{120} \mathrm{~s} \)
(4) \( \frac{1}{240} \mathrm{~s} \)
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