JEE Main 2022 · 27 Jul · Shift 2 · Physics Q41

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PhysicsSingle correct+4 / -1Question 41 of 90

(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.

(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 options given below :

(A) and (B) only

(A) and (D) only

(B) and (E) only

(B) and (C) only

Answer and worked solution

Official answer: B

$v_d=\frac{eE\tau}m=\frac{eV\tau}{mL}$ , so it is inversely proportional to L (D) and depends on V. Higher temperature shortens τ, so $v_d$ falls (A).

(B)

Topics:Drift velocity and current

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JEE Main 2022 · 27 Jul · Shift 2, Physics question 41