Target Exam

CUET

Subject

Physics

Chapter

Alternating Current

Question:

In a series LCR circuit $X_L = X_C$. Which of the following is correct?

Options:

Current leads voltage in phase

Current lags voltage in phase

The current amplitude is maximum

Current amplitude is minimum

Correct Answer:

The current amplitude is maximum

Explanation:

The correct answer is Option (3) → The current amplitude is maximum

In a series LCR circuit, at resonance:

$X_L = X_C \Rightarrow \text{Reactances cancel}$

At resonance:

  • Impedance $Z = R$ (minimum)
  • Current amplitude $I_{\max} = \frac{V}{R}$ (maximum)
  • Current is in phase with voltage

Given options:

Correct statement: The current amplitude is maximum