Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity that remains constant along the conductor is:
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Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity that remains constant along the conductor is:

G1 Physics · Accepted Answer

Step 1: Continuity of charge requires steady current to be the same through every cross-section of a series conductor. Step 2: J = I/A, and v(drift) = I/(neA) change as A changes. Electric field also generally changes. Step 3: Only current I remains constant.