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A long, straight, hollow conductor (tube) carrying a current has two sections A and C of unequal cross sections joined by a conical section B. 1,2 and 3 are points on a line parallel to the axis of the conductor. The magnetic fields at 1,2 and 3 have magnitudes `B_1, B_2 and B_3`. Then,

A

`B_(1)=B_(2)=B_(3)`

B

`B_(1)=B_(2)neB_(3)`

C

`B_(1) lt B_(2) lt B_(3)`

D

`B_(2)` cannot be found unless the dimensions of the section `B` are known

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A
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