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  4. 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 remains unaffected. The agent that is essentially responsible for it is

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Q. 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 $I$ remains unaffected. The agent that is essentially responsible for it is

Current Electricity

Solution:

The direction of current density is the direction of flow of positive charge in the circuit which is possible due to electric field produced by charges accumulated on the surface of wire