An alternating e.m.f. is applied to pure...

An alternating e.m.f. is applied to purely capacitive circuit. The phase relation between e.m.f. and current flowing in the circuit is

A

e.m.f. is ahead of current by `pi/2`

B

current is ahead of e.m.f. `by pi/2`

C

current is ahead of e.m.f. by `pi`

D

current is ahead of e.m.f. by `pi`

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