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.