First slide

Phasors and Phasor Diagrams

Question

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

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 $π / 2 .$

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