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

Options

A. the magnetic field is different at different points inside the pipe.
B. the magnetic field at any point inside the pipe is zero.
C. the magnetic field at all points inside the pipe is the same, but not zero.
D. the magnetic field is zero only on the axis of the pipe.

Answer

b

Explanation

Using Ampere.s law, we can explain that magnetic field inside the pipe is zero everywhere. Hence option (b) is correct.