Two wires made of different materials have the same uniform current density.They carry the same current only if:
A)their lengths are the same
B)their cross-sectional areas are the same
C)both their lengths and cross-sectional areas are the same
D)the potential differences across them are the same
E)the electric fields in them are the same

Question

Quizplus · Accepted Answer

The current density is defined as the current per cross-sectional area, so if two wires have different cross-sectional areas but the same current density, they will not carry the same current. Therefore, the two wires must have the same cross-sectional area to carry the same current, regardless of their material.

Two Wires Made of Different Materials Have the Same Uniform