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
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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=e0sinωti=iosinωt+π2 i.e. current is ahead of emf by π2