Question

Why is an electric current density defined ?

Answer 1

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 Electric current density is related to electromagnetism .
It is defined as the amount of electric current flowing through a unit cross-sectional area.

1. It is a vector quantity.
2. The SI unit of electric current density is ampere per square meter.
3. The symbol "J" is used for electric current density.

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Answer 2

current density is the electric current per unit area of cross section. The current density vector is defined as a vector whose magnitude is the electric current per cross-sectional area at a given point in space, its direction being that of the motion of the charges at this point.