Question

The circuit is said to be in resonance if the current is ____ with the applied voltage.

(a) in phase

(b) out of phase

(c) 45⁰ out of phase

(d) 90⁰ out of phase

The question was asked by my school teacher while I was bunking the class.

This interesting question is from Series Resonance topic in portion Resonance & Magnetically Coupled Circuit of Network Theory

Answer 1

The correct answer is (a) in phase

Easy explanation: The circuit is said to be in resonance if the current is in phase with the applied voltage and not if the current is out of phase with the applied voltage. The study of resonance is very useful particularly in the area of communications.