A hollow copper wire with an inner diameter of 0.70 mm and an outer diameter of 2.4 mm carries a current of 13 .What is the current density in the wire?

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.