A) current, electric field and drift speed
B) drift speed only
C) current and drift speed
D) current only
Correct Answer: D
Solution :
(d) current only When a steady current flows through a metallic conductor of non-uniform cross-section, then drift velocity \[\text{=}\frac{\text{1}}{\text{enA}}\] \[\Rightarrow {{\text{V}}_{d}}\propto \frac{1}{A}\] \[E=\frac{l}{\sigma A}\] \[\Rightarrow E\propto \frac{1}{A}\] Both \[{{V}_{d}}\]and E change with A, only current constant as it does not depend on the area of the conductor.
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