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 respectively, then:
A
B 1 = B 2 = B 3
B
B 1 = B 2 
B 3
B 3
C
B 1 < B 2 < B 3
D
B 2 cannot be found unless the dimensions of the section B are known
Text Solution
Verified by ExpertsThe correct answer is:
A
Current not depends on area of cross section of wire
So 
and 
.
Hence, 
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