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NEETPhysicsAlternating Current

Which graph shows the correct variation of r.m.s. current ' I ' with frequency ' f ' of a.c. in case of (LCR) series resonance circuit?

Options

  1. AQ
  2. BP
  3. CR
  4. DS

Correct answer

D. S

Step-by-step solution

In series, Z = (2 fL - 1 2 fC )^2+ R ^2 Current, I= V (2 fL - 1 2 fC )^2+ R ^2 As frequency increases, current first increases and then decreases. Current is maximum at resonance when X _ L = X _ C

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