Question

Consider a current carrying wire in the shape of a circle. As the current progresses along the
wire, the direction of j changes in an exact manner, while the current remain unaffected. The
agent that is essentially responsible for is​

Answer 1

The  agent that is essentially responsible for is​ electric field produced by charges accumulated on the surface of wire.

Explanation:

As the current flows from positive terminal to negative terminal therefore we can say that;

J = l / A

J = ne Vd

Density = E / J

Density = E / ne Vd

So we can say that;

• The current density is a vector quantity.
• Its direction is given by the direction of flow of positive charge in the circuit.
• Electric field produced by charges accumulated on the surface of wire also show the same current density in the same direction.