An AC voltage is given by : \( E=E_{0} \sin \frac{2 \pi t}{T} \) Then the \( \mathrm{P} \) mean ...

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An AC voltage is given by : \( E=E_{0} \sin \frac{2 \pi t}{T} \) Then the
\( \mathrm{P} \)
mean value of voltage calculated over time interval
W
of \( T / 2 \) seconds
(1) is always zero
(2) is never zero
(3) is \( \left(2 E_{0} / \pi\right) \) always
(4) may be zero
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