An \( \mathrm{AC} \) voltage is given by : \[\mathrm{E}=\mathrm{E}_{0} \sin \frac{2 \pi \mathrm{...

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