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A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor is /are

1. current, electric current and drift velocity
2. drift speed only
3. current and drift speed only
4. current only

Correct answer: current only

Solution

In a steady current, the same amount of charge per second must pass through every cross-section, so the current is constant everywhere. Since the conductor’s area changes, the drift speed must change inversely with area, so it is not constant.

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