Question

In a circuit, if 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

The correct option is D Only $L$

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