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In a purely capacitive ac circuit, the current is
ABehind the voltage by 90 degrees
BOpposite to the voltage
CAhead of the voltage by 90 degrees
DIn phase with the voltage
Answer & Solution
Correct answer: C. Ahead of the voltage by 90 degrees
Charge on a capacitor follows the voltage, and current is its rate of change, so current reaches its maximum a quarter cycle earlier.
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