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Ratio of specific resistances of two wires from the metre bridge null point and diameter ratio

The same question, asked 2 times: 13 Apr 2026 S1, 15 May 2026 S2. Every wording below, oldest first.

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  1. Question 1

    13 Apr 2026 S1

    130
    Two wires A and B of equal lengths are connected in left and right gap respectively of a metre bridge, null point is obtained at 40 cm from left end. Diameters of the wires A and B are in the ratio 3:1 respectively, the ratio of specific resistance of A to that of B is

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  2. Question 2

    15 May 2026 S2

    129
    Two wires AA and BB of equal lengths are connected in left and right gap of a metre bridge, null point is obtained at 4040 cm from left end. Diameters of the wires AA and BB are in the ratio 3:13 : 1. The ratio of specific resistance of AA to that of BB is

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