Two wires 'A' and 'B' of equal lengths are connected in left and right gaps, of meter bridge, respectively. The null point is obtained at 40 ~cm from left end. Diameters of the wires 'A' and 'B' are in the ratio 3: 1 , the ratio of specific

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Two wires 'A' and 'B' of equal lengths are connected in left and right gaps, of meter bridge, respectively. The null point is obtained at 40 ~cm from left end. Diameters of the wires 'A' and 'B' are in the ratio 3: 1 , the ratio of specific resistance of 'A' to that of 'B' is

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Correct answer: C. 6: 1

array l R₁ R₂ = 40 60 = 2 3 = ₁ ₁ A₁ ₂ ₂ A₂ = r₂² ₂ r₁² = ₁ r₂² ₂ r₁² ₁= ₂ ₁ ₂ = r₁² r₂² 2 3 = 6 1 array r₁ r₂ = 3 1

Two wires 'A' and 'B' of equal lengths are connected in left and right gaps, of meter bridge, respectively. The null point is obtained at 40 ~cm from left end. Diameters of the wires 'A' and 'B' are in the ratio 3: 1 , the ratio of specific resistance of 'A' to that of 'B' is

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