NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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Resistance of conductor is doubled keeping the potential difference across it constant. The rate of generation of heat will

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Correct option: B

be halved

Option B (be halved) is correct because the rate of heat generation is inversely proportional to the resistance when the potential difference is constant.

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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{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

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