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(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

Answer 1

answer : option (b) current is ahead of emf by π/2

explanation :

it is given that, An alternating e.m.f is applied to purely capacitive circuit.
Then , equation of emf is given by, $E=E_0sin\omega t$ and the equation of current is given by, $i=i_0cos\omega t$ or, $i=i_0sin(\omega t+\pi/2)$

here it is clear that, phase of current is leading by π/2.

hence, The phase relation between emf and current flowing in the circuit is option (b) e.g., Current is ahead of emf by π/2 .