The current density at a point in the conductor is defined as the current per unit cross-section area.Thus if the charge is flowing per unit time uniformaly over the area of cross-section A of the conductor,then current density J at any point on that area is defined as
J=I/A -(2)
It is the characterstic property of point inside the conductor nor of the conductor as a whole
Direction of current density is same as the direction of conventional current
Note that current density is a vector quantity unlike electric current
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