First slide

AC Circuits

Question

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

Easy

A

e.m.f. is ahead of current by $π$ / 2
B

Current is ahead of e.m.f. by $π$ / 2
C

Current lags behind e.m.f. by $π$
D

Current is ahead of e.m.f. by $π$

Solution

For purely capacitive circuit $e = e_{0} sinωt$
$i = i_{o} \sin (ωt + \frac{π}{2})$ i.e. current is ahead of emf by $\frac{π}{2}$

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