A current flows along the length of an infinitely long, straight, thin-walled pipe. Then:
- Athe magnetic field is zero only on the axis of the pipe
- Bthe magnetic field is different at different points inside the pipe
- Cthe magnetic field at any point inside the pipe is zero
- Dthe magnetic field at all points inside the pipe is the same, but not zero
Solution & Step-by-step Explanation
For a thin-walled pipe carrying current , we apply Ampere's circuital law:
Consider an Amperian loop of radius inside the pipe (). Since the current flows only on the surface of the thin wall, the current enclosed by the loop .Thus, at all points inside the pipe.
Consider an Amperian loop of radius inside the pipe (). Since the current flows only on the surface of the thin wall, the current enclosed by the loop .Thus, at all points inside the pipe.