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Q.

Along, straight, hollow conductor (tube) l carrying a current has two sections A and C of unequal cross sections joined by a conical section B. 1, 2, and 3 are 3 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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a

B1 = B2 =B3

b

B1=B2 # B3

c

B1

d

B2 cannot be found unless the dimensions of the section Bare known

answer is A.

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Detailed Solution

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

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