Question

In a series L, R, C, circuit which is connected to a.c. source. When resonance is obtained then net impedance Z will be

• A. Z = R
• B. Z = L -1/C
• C. Z = L
• D. Z = 1/C

Answer 1

The correct option is A Z = R

Impedance of the series RLC circuit $Z=\sqrt{R^2+(X_c-X_L{)}^2}$
At resonance, $X_c=X_L$
$⟹Z=R$