A sinusoidal alternating current of peak value \( I_{0} \) passes t...

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A sinusoidal alternating current of peak value \( I_{0} \) passes through a heater of resistance \( \mathrm{R} \). What is the mean power output of the heater?
\( \mathrm{P} \)
(1) \( \quad I_{0}^{2} R \)
(2) \( \frac{I_{0}^{2} R}{2} \)
W
(3) \( 2 I_{0}^{2} R \)
(4) \( \quad \sqrt{2} I_{0}^{2} R \)
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