question_answer

The phase difference between the alternating current and emf is\[\pi /2\]. Which of the following cannot be the constituent of the circuit?                                              [AIEEE 2005]           

A) C alone

B) R, L

C) L, C 

D) L alone

Correct Answer: C

Solution :

[c] (i) In a circuit having C (i.e. capacitance) alone the voltage lags the current by

(ii) In circuit containing R (resistance) and L (inducting) the voltage leads the current by

(iii) In LC circuit the phase difference between current and voltage can have any value between 0 todepending on the values of L and C.

(iv) In a circuit containing L alone the voltage leads the current by \[\frac{\pi }{2}\].