Question

A copper wire of the non-uniform area of cross-section is connected to a d.c. battery. The physical quantity, which remains constant along the wire is ______.

Answer 1

A copper wire of the non-uniform area of cross-section is connected to a d.c. battery. The physical quantity, which remains constant along the wire is resistivity.

Explanation:

Resistivity is a property of the material and depends only on the nature of the material and temperature. Since the wire is made of copper and the temperature is assumed constant, the resistivity remains the same along the entire length of the wire, even if the cross-sectional area is non-uniform.