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Potential gradient from the current through the wire and its resistance

This type of question, asked 2 times: 12 May 2024 S1, 13 May 2026 S2. All 2 questions below, oldest first.

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  1. Question 1

    12 May 2024 S1

    8
    Resistance of a potentiometer wire is 2 Ω/m2\,\Omega/\text{m}. A cell of e.m.f. 1.5 V balances at 300 cm. The current through the wire is

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  2. Question 2

    13 May 2026 S2

    129
    A current of 0.010.01 A passes through the potentiometer wire of resistivity 106 Ω10^6\,\Omega cm and area of cross-section 10−2 cm210^{-2}\ \mathrm{cm^2}. The potential gradient is (in V/m)

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