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Q.

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 ?

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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 is B.

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Detailed Solution

For purely capacitive circuit, e=e0sinωt i=iosinωt+π2 i.e., current is ahead of emf by π/2.
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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 ?