When resonance is produced in a series LCR circuit, then which of the following is not correct?

When resonance is produced in a series LCR circuit, then which of the following is not correct?
  1. Current in the circuit is in phase with the applied voltage.
  2. Inductive and capacitive reactances are equal.
  3. If $\mathrm{R}$ is reduced, the voltage across capacitor will increase.
  4. Impedance of the circuit is maximum.

Solution

Impedance $(Z)$ of the series LCR circuit is $Z=\sqrt{R^2+\left(X_L-X_C\right)^2}$ At resonance, $\mathrm{X}_{\mathrm{L}}=\mathrm{X}_{\mathrm{C}}$ Therefore, $Z_{\text {minimum }}=R$

Asked in: JEE Main 2013 (25 Apr Online)

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