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  4. A long, straight, hollow conductor tube carrying a current has two sections A and C of unequal cross section joined by a conical section B.1,2 and 3 are the points on a line parallel to the axis of the conductor. The magnetic fields at 1,2 and 3 have magnitude B1,B2 and B3: <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-uswvt7d8dbqrr9c9.jpg />

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Q. A long, straight, hollow conductor tube carrying a current has two sections $A$ and $C$ of unequal cross section joined by a conical section $B.1,2$ and $3$ are the points on a line parallel to the axis of the conductor. The magnetic fields at $1,2$ and $3$ have magnitude $B_{1},B_{2}$ and $B_{3}:$
Question

NTA AbhyasNTA Abhyas 2020

Solution:

Current not depends on area of cross section of wire
So $I_{A}=I_{B}=I_{C}=I$ and $B \propto I$ .
Hence, $B_{1}=B_{2}=B_{3}$