The electric current density is _________?

Concept:

Current density:

• Denoted by J, the electric current density is the rate at which charge flows (electric current) per unit area of cross-section.
• It is a vector quantity since it has both magnitude and direction.
• Its magnitude is the current per unit area and its direction is the same as that of the charges at that point.
• Current per unit area (taken normal to the current), I/A, is called current density.
  It is denoted by J.
• The SI units of the current density are A/m2 and dimension is given by M0L-2T0I1 or [M0 L−2 T−1 Q]