Consider a current carrying wire (current I) in the shape of a circle. Note that as the current progresses along the wire, the direction of j (current density) changes in an exact manner, while the current I remain unaffected. The agent that is essentially responsible for is

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Philoid · Accepted Answer

The amount of electric current flowing (or the amount of charge flown per unit time) per unit area is termed as Current Density(j). Mathematically, it can be expressed as:

Here, E is the electric field, ρ is the resistivity of the material and