An alternating e.m.f. is applied to purely capacitive circuit. Th… - Vidyadip

MCQ

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 orIn a circuit containing capacitance only

A
e.m.f. is ahead of current by $\pi$ $ / 2 $
✓
Current is ahead of e.m.f. by $\pi$ $ / 2$
C
Current lags behind e.m.f. by $\pi$
D
Current is ahead of e.m.f. by $\pi$

✓

Answer

Correct option: B.

Current is ahead of e.m.f. by $\pi$ $ / 2$

b
(b) For purely capacitive circuit $e = {e_0}\sin \omega t$
$i = {i_o}\sin \left( {\omega t + \frac{\pi }{2}} \right)$ i.e. current is ahead of emf by $ \frac{\pi }{2} $

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