Question

In which of the following circuits can resonance NOT occur?

Options

• Series RLC circuit

• Series LC circuit

• Series RL circuit

• Series RLC circuit with very high R

Answer 1

Series RL circuit

Explanation:

Resonance requires both an inductor (L) and a capacitor (C) to be present. Only then can X_L and X_C​ cancel each other. In an RL or RC circuit, one of these elements is missing, so the cancellation cannot happen and resonance is not possible.