question_answer

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 \[\overrightarrow{J}\] (current density) changes in an exact manner, while the current / remains unaffected. The agent that is essentially responsible for it is:                                                                   (NCERT EXEMPLAR)

A) source of emf

B) electric field produced by charges accumulated on the surface of wire

C) the charges just behind a given segment of wire which push them just right way by repulsion

D) the charges ahead