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

Options

A. The magnetic field at all points inside the pipe is the 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 points inside the pipe.

Answer

B

Explanation

Using Ampere's law magnetic field is zero inside the pipe.