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  • A current I flows along the length of an infinitely long, straight, thin walled pipe. ThenOption: 1 the magnetic field at all points inside the pipe

A current I flows along the length of an infinitely long, straight, thin walled pipe. Then

Option: 1

the magnetic field at all points inside the pipe is the same but not zero.


Option: 2

the magnetic field at any point inside the pipe is zero.


Option: 3

the magnetic field is zero only on the axis of the pipe.


Option: 4

the magnetic field is different at different points inside the pipe.


Answers (1)

best_answer

From Ampere's law, we have
\mathrm{\oint B \cdot d l=\mu_0 I }
Since no current exists in the medium (air) inside the pipe I=0. Hence B=0. Hence the correct choice is (b).

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