A long, straight, hollow conductor (tube) carrying a current has two sections 
and 
of unequal cross‐section joined by a conical section 
and 3 are points on a line parallel to the axis of the conductor. The magnetic fields at 1, 2 and 3 have magnitudes 
and 
:
A
B
C
D
cannot be found unless the dimensions of the section 
are known
Text Solution
Verified by ExpertsThe correct answer is:
A
To find the magnetic field outside a thick conductor, the current may be assumed to flow along the axis. As points 1, 2, 3 are equidistant from the axis. 
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