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Current-carrying wire held up by the magnetic force of a wire below it

This type of question, asked 2 times: 9 May 2024 S1, 11 Apr 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    9 May 2024 S1

    25
    A long straight wire carrying a current of 25 A rests on the table. Another wire PQ of length 1 m and mass 2.5 g carries the same current but in the opposite direction. The wire PQ is free to slide up and down. To what height will wire PQ rise? (μ0=4π×10−7\mu_0=4\pi\times10^{-7} SI unit)

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  2. Question 2

    11 Apr 2026 S2

    132
    A wire AB is carrying steady current I1I_1 and is kept on the table. Another wire CD carrying current I2I_2 is held directly above as shown in figure. When the wire CD is left free and it remains suspended at its position, its mass per unit length is (g=acceleration due to gravity, μ0\mu_0 = permeability of free space)

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