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The circuit diagram given in the figure shows the experimental setup for the measurement of unknown resistance by using a meter bridge. The wire connected between the points P & Q ( PQ =100 ~cm ) has uniform cross-sectional area and its resistivity is directly proportional to the distance from point P . Null point is obtained with the jockey J with R₁ and R₂ in the given position. On interchanging the positions R₁ an

Correct answer

35

Step-by-step solution

From the given circuit diagram R₁ R₂ = x^2 (100)^2-x^2 x=85 Also R₂ R₁ = y^2 (100)^2-y^2 y=50 =(85-50) cm =35 ~cm

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