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  Solved  Paper-2005                 

A) C alone                

B)        R, L        

C)        L, C        

D)        L alone

Correct Answer: C

Solution :

(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 \[\frac{\pi }{2}\].