Fewpal
+1 vote
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in JEE by (20 points)

Consider a current carrying wire (current I) in shape of circle. Note that as the current progress

along the wire , the direction j(current density) changes in exact manner, while current I remain

unaffected. The agent that is essentially responsible is :-

  1. Source of EMF
  2. Electric field produced by charge accumulated on the surface of wire
  3. The charges just behind a given behind segment of wire which push them just right way by repulsion.
  4. The charges ahead

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1 Answer

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Current per unit area (taken normal to the current), I/A, is called current density and correct option is (D)

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