Electric Circuits
When AC flows through a pure capacitance then the current

 leads the emf by - 90o.
 leads the emf by 90o.
 is in phase with emf.
 lags the emf by 90o.

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Electric Circuits
What is time period T?

 Time taken by an alternating quantity to reach the peak value.
 Time taken by an alternating quantity to complete one full cycle.
 Time taken by an alternating quantity to complete the (+)ve half.
 Time taken by an alternating quantity to complete the (-)ve half.

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