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A steady current is passing through a linear conductor of non uniform cross- section. The net quantity of charge crossing any cross section per second is

1. Independent of area of cross-section
2. Directly proportional to the length of the conductor
3. Directly proportional to the area of cross section.
4. Inversely proportional to the length of the conductor

Correct answer: Independent of area of cross-section

Solution

In steady state, charge cannot accumulate anywhere in the conductor, so the same amount of charge must cross every cross-section each second. If the area changes, the current density changes, not the total current.

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