Question

Define current density. Write its SI unit and dimension

Answer 1

Current density—Current density of a conductor is defined as the amount of current passing per unit area of the conductor held to the flow of chares :

It can be expressed as— 

J = I/A

It is a vector quantity.

The S.I. unit of current density is ampere/ metre² (Am^–2)

The dimension of current density is [M^ºL^–2T^ºA]