Consider a current carrying wire (current \( I \) ) in the shape of...

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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
\( \mathrm{P} \) \( \mathbf{j} \) (current density) changes in an exact manner, while the current \( I \)

W remain 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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