JEE Main 2022 Physics question
(A) The drift velocity of electrons decreases with the increase in the temperature of conductor. (B) The drift velocity is inversely proportional to the area of cross-section of given conductor. (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. Choose the correct answer from the option given below
Solution
The drift velocity is = I/(neA), so for a given current it is inversely proportional to the area of cross-section, and (B) is correct. With increasing temperature the relaxation time (and so the drift velocity) of the
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