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NEET 2015 (AIPMT, Cancelled Paper) · Electric Current, Drift Velocity & Current Density

Electric Current, Drift Velocity & Current Density question from NEET 2015 (AIPMT, Cancelled Paper)

Q31NEET 2015 · AIPMT · CANCELLED PAPEREasy

Electric Current, Drift Velocity & Current Density

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is

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Answer: (d)

The conductor is a single series path, so the same charge passes every section per second: current $I$ is constant.
$J = I/A$ , $v_d = I/(neA)$ and $E = \rho J$ all change with area $A$ .
So the answer is (d) current.

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