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(D) In an $AC$ circuit,the phase difference $\phi$ between the alternating current and the electromotive force $(emf)$ is given by $	an \phi = \frac{

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$R-L$

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(D) In an $AC$ circuit,the phase difference $\phi$ between the alternating current and the electromotive force $(emf)$ is given by $	an \phi = \frac{X_L - X_C}{R}$.For a pure inductor ($L$ alone),$\phi = \frac{\pi}{2}$.For a pure capacitor ($C$ alone),$\phi = -\frac{\pi}{2}$ (magnitude is $\frac{\pi}{2}$).For an $L-C$ circuit,if $X_L 
eq X_C$,the phase difference is $\frac{\pi}{2}$.For an $R-L$ circuit,the phase difference $\phi$ lies in the range $0 Therefore,an $R-L$ circuit cannot have a phase difference of $\frac{\pi}{2}$.

The phase difference between the alternating current and emf is $\frac{\pi}{2}$. Which of the following cannot be the constituent of the circuit?

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