Question

In series L-C-R circuit, if applied voltage frequency $w>w_0$ ($w_0$ = resonant frequency) then

• A. $X_C>X_L$
• B. Current leads voltage
• C. Voltage leads current
• D. $Z<R$

Answer 1

The correct option is C Voltage leads current

$Z^2=R^2+(X_L-X_C{)}^2$ & $\frac{X_L}{X_C}=\frac{V_L}{V_C}$
for $w>w_0$
$w=\frac{1}{\sqrt{LC}}$
$w^2>\frac{1}{LC}$
$wL>\frac{1}{wC}$
$X_L>X_C\Rightarrow$