A constant current flows through a metallic conductor with a non-uniform cross-section. Which of the following constants exists along the conductor?

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Drift speed

Current

Current density

None of these

answer is B.

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Detailed Solution

Concept: Even if the wire is not consistent in thickness, the current is uniform throughout. This is due to the fact that the charge traveling through each cross sectional area per unit time remains constant throughout the wire. As a result, the existing situation stays unchanged.
The conductor is experiencing a steady flow of current, current is constant.
The current passing through the conductor remains constant, while drift speed and current density fluctuate as the cross-sectional area changes.
Hence, the correct option is 2.

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