An alternating e.m.f. is applied to a purely capacitive circuit. What is the phase relation between the e.m.f. and the current flowing in the circuit?
- Ae.m.f. is ahead of current by $\pi / 2$
- BCurrent is ahead of e.m.f. by $\pi / 2$
- CCurrent lags behind e.m.f. by $\pi$
- DCurrent is ahead of e.m.f. by $\pi$
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