Question

current density of a conducting wire....​

Answer 1

here is your answer mate :-

What is the current density? Answer: The current through the conductor is I = 6 mA = 0.006 amperes (or 6 x 10-3 amps).

Current density. ... 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. In SI base units, the electric current density is measured in amperes per square metre.

Current density. In order to describe the behavior of a semiconductor out of thermal equilibrium (upon application of an external voltage), we have to estimate the electrical currents resulting from the motion of charge carriers. ... an amount of charges per unit time, per unit area) instead of the current itself.

hope it helps