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COMEDK2018PhysicsAlternating Current

The value of alternating emf E in the given circuit will be

Options

  1. A220 ~V
  2. B140 ~V
  3. C100 ~V
  4. D20 ~V

Correct answer

C. 100 ~V

Step-by-step solution

The given circuit diagram is L-C-R . series circuit, where aligned &V_ R =80 ~V , V_ C =100 ~V &V_ L =40 ~V aligned Since, V_ C >V_ L Value of emf E is given as aligned E &= V_ R ²+ (V_ C -V_ L )² &= 80²+(100-40)² &= 6400+3600 =100 ~V aligned

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