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Question

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 B1,B2 and B3. Then,
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  1. B1=B2=B3
  2. B1<B2<B3
  3. B1=B2B3
  4. B2 cannot be found unless the dimension of the section B are known

A
B1=B2B3
B
B2 cannot be found unless the dimension of the section B are known
C
B1=B2=B3
D
B1<B2<B3
Solution
Verified by Toppr

To find the magnetic field outside a thick conductor, the current may be assumed to flow along the axis.
As points 1, 2 and 3 are equidistant from the axis.
B1=B2=B3

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