Question

A battery is connected to a uniform resistance wire $AB$ and $B$ is earthed. Which one of the graphs below shows how the current density $J$ varies along $AB$?

• A.
• B.
• C.
• D.

Answer 1

Answer: (D)

Answer 2

Wire $AB$ is uniform so current through wire $AB$ at every point across section will be same. Hence, current density $j=(i/A)$ at every point of the wire will be same.