NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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A constant voltage is applied between two ends of a metallic wire. If the wire is replaced by another wire of same material, half the length and doubled the radius, the rate of heat developed in the wire will be:

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Correct option: A

Increased 8 times

Option A (Increased 8 times) is correct because the rate of heat developed is inversely proportional to the resistance, and the resistance is halved due to the length and quartered due to the area.

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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

T

is In a thermocouple, which of the following statements is not true (A) The drift velocity of electrons decreases with the increase in the temperature of conductor.
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(C) The drift velocity does not depend on the applied potential difference to the conductor.
(D) The drift velocity of electron is inversely proportional to the length of the conductor.
(E) The drift velocity increases with the increase in the temperature of conductor.
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\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

constant along the length of the conductor

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