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 or In 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) 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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