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Consider a current carrying wire (curren...

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 `vecJ` (current density) changes in an exact manner, while the current I remains unaffected. The agent that is essentially responsible for is

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 the right way by repulsion

D

the charges ahead

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The correct Answer is:
A
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