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AIIMS2016PhysicsAlternating Current

Assertion : At resonance, L C R series circuit have a minimum current. Reason : At resonance, in LCR series circuit, the current and e.m.f are not in phase with each other.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

D. If both assertion and reason are false.

Step-by-step solution

At resonance X_L=X_C or L= 1 C . Because of this impedance of L C R series circuit become equal to resistance of circuit (Z= R^2+ (X_L-X_C )^2 ) . Therefore from I= E Z = E R , at resonance, current in LCR series circuit is maximum. Correspondingly phase angle is also equal to zero. Therefore emf and current are in phase in L C R series circuit.

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