Question

what will happens if bar magnet is cut diagonally​

Answer 1

The magnetic domains will roughly be distributed evenly throughout the magnet. If you cut it diagonally there is presumably the same amount of material in each half. The field strenght of each half will be the same. ...

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Answer 2

Answer:

Halving. When you cut a bar magnet into two pieces, the magnetic moments are still aligned as they originally were. In fact, this is the case for magnets of all shapes, including rings and horseshoes. If cut in two, they will still exhibit the properties of a standard dipole magnet.