For a metallic wire, the ratio of voltage to corresponding current is (a) independent of temperature. (b) increases with rise in temperature. (c) increases or decreases with rise in temperature depending upon the metal. (d) decreases with rise in temperature.

Answer: (b). V/I = R, and for a metal R = R₀(1 + α Δ T) with α > 0 Hotter metal: more ion vibration, shorter relaxation time, so resistance rises. So the answer is (b).

For a metallic wire, the ratio of voltage to corresponding current is | MHT CET 2019 (2 May, Shift 1)

Q43MHT CET 2019 · 2 MAY · SHIFT 1Easy

Ohm's Law, Resistivity & Temperature

For a metallic wire, the ratio of voltage to corresponding current is

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Answer: (b)

$\dfrac{V}{I} = R$ , and for a metal $R = R_0(1 + \alpha \Delta T)$ with $\alpha > 0$
Hotter metal: more ion vibration, shorter relaxation time, so resistance rises.
So the answer is (b).

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Ohm's Law, Resistivity & Temperature question from MHT CET 2019 (2 May, Shift 1)

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