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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. current
2. drift velocity
3. electric field
4. current density

Correct answer: current

Solution

In a metallic conductor, the current remains constant throughout the conductor, regardless of its cross-sectional area, due to the principle of conservation of charge. Other quantities like drift velocity and current density vary with the cross-sectional area.

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