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Alternating Current — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current1 Mark
Question
What is the average power given by an ac source to a capacitor?
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Answer

Phase difference between voltage and current in a capacitor $=\phi=90^{\circ}$
Average power $\overline{ P }= E _{ mxx } I _{ rms } \cos \phi=0$$\because \cos 90^{\circ}=0$

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