Yes, if you:
-drop it many times
-hammer it many times
-heat it over a flame
high temperature, AC magnetic fields, mechanical shocks, and physical distortion.
The known magnetism in a bar magnet is electromagnetism.
magnetism
A magnets magnetism is strongest at the poles.
No it wont but if the water is hot then it will lose its magnetism
magnetism
Magnet
the poles
Some words with the root "magnet" include magnetism, magnetic, and magnetize.
Permanet Magnet
Because the magnetism runs from one end of the magnet to the other - across the whole magnet. You cannot have magnetism running in opposing directions in the SAME magnet.
A magnet can lose its magnetism if exposed to high temperatures. If heated above the point called the Curie temperature, a magnet will lose its magnetism.