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Question: Answered & Verified by Expert
A current i flows in an infinitely long, straight and thin walled pipe, then
PhysicsMagnetic Effects of CurrentTS EAMCETTS EAMCET 2023 (13 May Shift 2)
Options:
  • A the magnetic field at all the points inside the pipe is same, but not zero
  • B the magnetic field at any point inside the pipe is zero
  • C the magnetic field is zero only on the axis of the pipe
  • D the magnetic field is different at different points inside the pipe
Solution:
1673 Upvotes Verified Answer
The correct answer is: the magnetic field at any point inside the pipe is zero
From the ampere's law
$$
\oint \mathrm{B} \cdot \mathrm{dl}=\mu_0 \mathrm{i}
$$
The current enclosed inside it is zero, the magnetic field will be equal to zero.

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