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JEE Mains · Physics · STD 12 -7. Alternating current
When resonance is produced in a series \(LCR\) circuit, then which of the following is not correct ?
- A Current in the circuit is in phase with the applied voltage
- B Inductive and capacitive reactances are equal
- C lf \(R\) is reduced, the voltage across capacitor wilI increase
- D Impedance of the circuit is maximum
Answer & Solution
Correct Answer
(D) Impedance of the circuit is maximum
Step-by-step Solution
Detailed explanation
Impedance ( \(Z\) ) ofthe series \(LCR\) circuit is \(\mathrm{Z}=\sqrt{\mathrm{R}^{2}+\left(\mathrm{X}_{\mathrm{L}}-\mathrm{X}_{\mathrm{C}}\right)^{2}}\) At resonance, \(\mathrm{X}_{\mathrm{L}}=\mathrm{X}_{\mathrm{C}}\) Therefore, \(Z_{\text {minimun }}=\mathrm{R}\)
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