Consider a wire of a circular cross-section with a radius of R = 3.07 mm. The magnitude of the current density is modeled as J = cr² = 5.25 X 106 A/m4r2. What is the current (in A) through the inner section of the wire from the center to r = 0.5R? A

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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.