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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: drifty velocity, electric field, current, current density

current

drifty velocity

electric field

current density

Solution:

Current is defined as charge flown per unit time. It should remain the same along any cross-section as there is no accumulation of charge in the conductor. Hence, current will remain constant.