Question

The expression of resonant frequency for parallel resonant circuit is?

(a) 1/(2π√LC)

(b) 1/(π√LC)

(c) 1/(2√LC)

(d) 1/√LC

This question was posed to me during a job interview.

My question is taken from Parallel Resonance in section Resonance & Magnetically Coupled Circuit of Network Theory

Answer 1

Right choice is (a) 1/(2π√LC)

To explain: The condition for resonance occurs when XL = XL. The expression of resonant frequency for parallel resonant circuit is fr = 1/(2π√LC).