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Consider a current carryiing wire (curre...

Consider a current carryiing wire (current I) in the shape of a circle

A

source of emf

B

electric field produced charges accumulated on the surface of wire

C

the charges just behind a given segment of wires which push them just the right way by repulsion

D

the charges ahead

Text Solution

Verified by Experts

The correct Answer is:
B
Current per unit area (taken normal to the current), 1/A, is called current density and is denoted by j. The SI units of the current density are `A//m^(2)`. The current density is also directed along E and is also a vector and the relationship is given by (J=SE). The j changes due to electric field produced by charges accumulated on the surface of wire.
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