JAMB Physics 2023 Paper

Concept:Resonance occurs when the inductive reactance and capacitive reactance in the circuit cancel each other out.Explanation:In an AC circuit, impedance $Z$ depends on resistance $R$, inductive reactance $X_L$, and capacitive reactance $X_C$.At resonance, $X_L = X_C$, so their combined effect becomes zero.This makes $Z = \sqrt{R^2 + (X_L - X_C)^2} = \sqrt{R^2} = R$.Therefore, the impedance becomes just the resistance of the circuit, which is its smallest possible value.The impedance is not zero unless the resistance itself is zero, so the correct description is minimum.Answer:D. Minimum