Question

In series LCR circuit, the phase difference between applied voltage and current is

• A. Positive when $X_L>X_C$
• B. Positive when $X_C>X_L$
• C. ${90}^{\circ }$
• D. $0^{\circ }$

Answer 1

Answer: (A)

Positive when $X_L>X_C$

Let the phase difference between applied voltage and current in series LCR circuit be $\varphi$.

Thus, $tan\varphi =\frac{i(X_L-X_C)}{iR}$

$=\frac{X_L-X_C}{R}$

Thus, it is positive for $X_L>X_C$.