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JEE Main202225 Jul 2022Morning ShiftPhysicsAlternating CurrentActual

To increase the resonant frequency in series LCR circuit,

Options

  1. ASource frequency should be increased
  2. BAnother resistance should be added in series with the first resistance.
  3. CAnother capacitor should be added in series with the first capacitor
  4. DThe source frequency should be decreased

Correct answer

C. Another capacitor should be added in series with the first capacitor

Step-by-step solution

The resonant frequency of an LCR circuit is given by f = 1 2 π L C . It does not depend on the source frequency as well as the resistance of the circuit. Therefore, to increase the resonating frequency product of L and C should decrease. By joining another capacitor in series, the equivalent capacitor will decrease. Hence, option C is correct option.

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