NEET 2015 Physics question

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

(1)currentCorrect
(2)drift velocity
(3)electric field
(4)current density

Answer: (1)

Solution

A conductor of non-uniform cross section can be regarded as many small cylindrical conductors joined in series. In a steady state the same charge per second passes every cross section, so the current is

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Question ID VK-091797