An $ac$ voltage is applied to a resistance $R$ and an inductor $L$ in series. If $R$ and the inductive reactance are both equal to $3\,\Omega$,the phase difference between the applied voltage and the current in the circuit is
- A$\frac{\pi}{6}$
- B$\frac{\pi}{4}$
- C$\frac{\pi}{2}$
- Dzero
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