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(C) In an $RL$ series circuit,the source voltage $V_s$ is given by the phasor sum of the voltage across the resistor $(V_R)$ and the voltage across th

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Both $(A)$ and $(B)$ are correct

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(C) In an $RL$ series circuit,the source voltage $V_s$ is given by the phasor sum of the voltage across the resistor $(V_R)$ and the voltage across the inductor $(V_L)$:$V_s = \sqrt{V_R^2 + V_L^2}$Given $V_R = 70 \, V$ and $V_L = 20 \, V$:$V_s = \sqrt{70^2 + 20^2} = \sqrt{4900 + 400} = \sqrt{5300} \approx 72.8 \, V$.Thus,statement $(A)$ is correct.The phase angle $\phi$ between the current and the source voltage is given by:$	an \phi = \frac{V_L}{V_R} = \frac{20}{70} = \frac{2}{7}$Therefore,$\phi = 	an^{-1} (2/7)$.Thus,statement $(B)$ is correct.Since both $(A)$ and $(B)$ are correct,the correct option is $(C)$.

The adjoining figure shows an $AC$ circuit with resistance $R$,inductance $L$ and source voltage $V_s$. Then

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