This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Permanent magnet loses its magnetism because of 4 reasons 1-when it is heated above a point called curie temperature 2-via shock 3-near a demagnetising field 4-when they are subjected to heat It loses its magnetising power and become weak in a duration of time.
1 5 1
It is demagnetized when heated strongly, thrown from a height or hammered.