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JEE Main 2023 (31 Jan, Shift 1) · Electric Current, Drift Velocity & Current Density

Electric Current, Drift Velocity & Current Density question from JEE Main 2023 (31 Jan, Shift 1)

Q13JEE Main 2023 · 31 JAN · SHIFT 1Medium

Electric Current, Drift Velocity & Current Density

The drift velocity of electrons for a conductor connected in an electrical circuit is $V_{d}$ . The conductor is now replaced by another conductor with same material and same length but double the area of cross section. The applied voltage remains same. The new drift velocity of electrons will be

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Answer: (b)

$v_d = \dfrac{eE\tau}{m} = \dfrac{eV\tau}{ml}$
Same material ( $\tau$ ), same $V$ and same $l$ , so $v_d$ does not depend on the area.
So the answer is (b) $V_d$ .

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