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NEETPhysicsAlternating Current

Resonance occurs in a series LCR circuit when the frequency of the applied emf is 1000 Hz. Then (a) when frequency (=900 ~Hz ), then the current through the voltage source will be ahead of e.m.f. of the source (b) the impedance of the circuit is minimum at ( f =1000 ~Hz ) (c) at resonance the voltage across L and current in C differ in phase by (180^ ) (d) If the value of C is doubled resonance occurs at ( f =2000 ~H

Options

  1. Aonly a & b are correct
  2. Ba, b, c are correct
  3. Cc & d are correct
  4. Dall are correct

Correct answer

A. only a & b are correct

Step-by-step solution

At frequency lower than resonant frequency since ( X _ C > X _ L ) ( ) Current leads voltage ( ) At resonance, impedance is minimum. ( ) At resonance, phase diff. between voltage across L and current in C is ( 2 ) ( f = 1 2 LC )

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