Consider a current carrying wire (current \(\text{I}\)) in the shape of a circle. Note that as the current progresses along the wire, the direction of \(\text{j}\) (current density) changes in an exact manner, while the current \(\text{I}\) remains unaffected. The agent that is essentially responsible for it is:
| 1. | source of emf. |
| 2. | the electric field produced by charges accumulated on the surface of the wire. |
| 3. | the charges just behind a given segment of wire which push them just the right way by repulsion. |
| 4. | the charges ahead. |
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