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In a metre bridge experiment null point is obtained at 20 ~cm from one end of the wire when resistance X is balanced against another resistance Y . If X < Y , then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4 X against Y?

Options

  1. A50 ~cm
  2. B80 ~cm
  3. C40 ~cm
  4. D70 ~cm

Correct answer

A. 50 ~cm

Step-by-step solution

We have from meter bridge experiment, R ₁ R ₂ = ₁ ₂ , where ₂= (100- ₁ ) cm In the first case, X / Y=20 / 80 In the second case 4 X Y = 100- =50 ~cm .

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