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(A) In an $ac$ circuit,if the current lags behind the voltage by a phase angle $\phi$,the circuit must be an inductive circuit containing a resistor $

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$R$ and $L$

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(A) In an $ac$ circuit,if the current lags behind the voltage by a phase angle $\phi$,the circuit must be an inductive circuit containing a resistor $(R)$ and an inductor $(L)$.In an $RL$ series circuit,the voltage across the resistor $(V_R)$ is in phase with the current $(I)$,while the voltage across the inductor $(V_L)$ leads the current by $90^\circ$.The resultant voltage $V$ leads the current by a phase angle $\phi$,which is given by:$	an \phi = \frac{V_L}{V_R} = \frac{I_0 X_L}{I_0 R} = \frac{X_L}{R}$Since the current lags behind the voltage,the circuit must contain $R$ and $L$.

In an $ac$ circuit,the current lags behind the voltage by $\pi /3$. The components in the circuit are

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