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Q.

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

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a

the charges ahead.

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

source of emf.

answer is B.

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Detailed Solution

As we know that current density (J) depends on
(i) conductivity σ=1/ρ=1/R·A
(ii) Electric field J=σE
(iii) current, length and area of cross-section But in the given options only B, that is, electric field can be varied by the charges accumulated on the surface of wire.

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