Physics 2010 JAMB Past Questions - Question 42: Two inductors current circuit at resonance, the angle of lead or lag is

Correct Answer

A

Explanation

In a resonant circuit with two inductors, the phase relationship between the current and voltage can vary depending on the circuit configuration.

1. Series Resonance:
  In a series resonant circuit, the inductors and capacitors are connected in series. At resonance, the impedance of the circuit is purely resistive, and the current leads the voltage by 90 degrees. This means that the current is ahead of the voltage by a quarter of a cycle or a quarter of the period.

2. Parallel Resonance:
  In a parallel resonant circuit, the inductors and capacitors are connected in parallel. At resonance, the impedance of the circuit is minimized, and the current lags the voltage by 90 degrees. This means that the current is behind the voltage by a quarter of a cycle or a quarter of the period.

So, in a resonant circuit with two inductors, the angle of lead or lag depends on whether the circuit is a series or parallel resonance circuit. In a series resonance circuit, the current leads the voltage by 90 degrees, while in a parallel resonance circuit, the current lags the voltage by 90 degrees.