Magnetic field due to currentHard
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 respectively, then :
Options
A.B1 = B2 = B3
B.B1 = B2 ≠ B3
C.B1 < B2 < B3
D.B2 cannot be found unless the dimensions of the section B are known
Solution
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, B1 = B2 = B3
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