Question

In a series $LCRAC$ circuit, the current is maximum when the impedance is equal to:

• A. the reactance
• B. the resistance
• C. zero
• D. twice the reactance
• E. twice the resistance

Answer 1

The correct option is B the resistance

In L-C-R circuit, the current
$I=\frac{E_0}{\sqrt{R^2+(X_L-X_C{)}^2}}$
When impedance $Z=R$, i.e., $X_L=X_C$ the current in the L-C-R circuit will be maximum.