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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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For a metallic wire, the ratio

\frac{V}{i}(V =

applied potential difference and

i

=current flowing ) is

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Correct option: B

Increases as the temperature rises

Option B (Increases as the temperature rises) is correct because the resistance of a metallic wire increases with temperature, and V/i = R.

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In the absence of applied potential, the electric current flowing through a metallic wire is zero because A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature

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\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}