Question

What is electric current density

Answer 1

hi
In electromagnetism, 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.
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Answer 2

Hey there!

Electric Current Density:

Electric current density is defined as a vector magnitude that has units of electric current per unit area. It's S.I unit is ampere/meter²(A/m²) with dimensional formula A L⁻².

Relation Between Electric Current and Current Density:

$\boxed{\displaystyle I = \int_A j\cdotp d\bold A}$

where,

I = Electric Current in Ampere.

j = Current density

S = Area

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