Q. 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)
Explanation
(d) Wire $AB$ is uniform so current through wire $AB$ at every across section will be same. Hence current density, $J( = i/A)$ at every point of the wire will be same
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.