What's wrong in this diagram?
The reason is this: magnetic field lines between the two poles of magnet are perfectly straight in the given diagram, which is not possible.
Fringing effect of the lines is inevitable
I was investigating why there is fringing effect, and then I came across a line in NCERT physics text book that if there was no fringing effect it would violate Ampere's law. Can anyone please explain how Ampere's law is violated?