Question

In a circuit, the current lags behind the voltage by a phase difference of $ \pi/2 $ , the circuit will contain which of the following ?

• A. Only $ R $
• B. Only $ C $
• C. $ R $ and $ C $
• D. Only $ L $

Answer 1

Answer: (D)

When a circuit contains inductance only, then the current lags behind the voltage by the phase difference of $ \frac{ \pi}{ 2} $ or $ 90^\circ $
While in a purely capacitive circuit, the current leads the voltage by a phase angle of $ \frac{ \pi}{ 2} $ or $ 90^\circ $
In a purely resistive circuit current is in phase with the applied voltage.