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KCET2024PhysicsAlternating Current

Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

Options

  1. AR=20 L=1.5 H , C=35 ~F
  2. BR=25 L=2.5 H , C=45 ~F
  3. CR=25 , L=1.5 H , C=45 ~F
  4. DR=15 L=3.5 H , C=30 ~F

Correct answer

D. R=15 L=3.5 H , C=30 ~F

Step-by-step solution

For better tunning of an L-C-R circuit used in for communication, quality factor Q must be high. Q= 1 R L C In option (4), R and C is minimum and L is maximum. Thus, the value of R, L and C given in option (4) suitable for better communication.

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