A current flows along the length of an infinitely long, straight, thin walled pipe. Then
the magnetic field at all points inside the pipe is the same, but not zero
the magnetic field is zero only on the axis of the pipe
the magnetic field is different at different points inside the pipe
the magnetic field at any point inside the pipe is zero
As we learnt in
Ampere's Law -
Total Current crossing the above area is
- wherein
Outward postive
Inward negative X
Magnetic field is shielded and no current is inside the pipe to apply Ampère’s law. (Compare to electric field inside a hollow sphere).
Option 1)
the magnetic field at all points inside the pipe is the same, but not zero
Incorrect option
Option 2)
the magnetic field is zero only on the axis of the pipe
Incorrect option
Option 3)
the magnetic field is different at different points inside the pipe
Incorrect option
Option 4)
the magnetic field at any point inside the pipe is zero
Correct option
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