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A circular coil of single turn has a resistance of 20 . Which one of the following is the correct value for the resistance between the ends of any diameter of the coil?

Options

  1. A5
  2. B10
  3. C20
  4. D40

Correct answer

A. 5

Step-by-step solution

Each of the two semicircles between the two ends of the diameter has a resistence of 20 / 2=10 . These two resistors are in parallel between the 2 ends of the diameter. Thus the effective resistance R = R ₁ R ₂ R ₁+ R ₂ = 10 10 10+10 = 100 20 =5

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