An ac voltage is represented by \[ E=220 \sqrt{2} \cos (50 \pi) t \] \( \mathrm{P} \) W How many...

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An ac voltage is represented by
\[
E=220 \sqrt{2} \cos (50 \pi) t
\]
\( \mathrm{P} \)
W
How many times will the current become zero, in \( 1 \mathrm{~s} \) ?
(1) 50 times
(2) 100 times
(3) 30 times
(4) 25 times
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