Electro Magnetic Induction And Alternating Currents Question 4
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 [MP PET 1996; AIIMS 1997]
Options:
A) e.m.f. is ahead of current by p / 2
B) Current is ahead of e.m.f. by p / 2
C) Current lags behind e.m.f. by p
D) Current is ahead of e.m.f. by p
Show Answer
Answer:
Correct Answer: B
Solution:
For purely capacitive circuit $ e=e_{0}\sin \omega t $ $ i=i_{o}\sin ( \omega t+\frac{\pi }{2} ) $ i.e. current is ahead of emf by $ \frac{\pi }{2} $
