Question

Heating of magnet does not demagnetize is true and false

Answer 1

If a magnet is stored away from power lines, other magnets, high temperatures, and other factors that adversely affect the magnet, it will retain its magnetism essentially forever. Modern magnet materials do lose a very small fraction of their magnetism over time.

Answer 2

When heated above 176° Fahrenheit (80° Celsius), magnets will quickly lose their magnetic properties. The magnet will become permanently demagnetized if exposed to these temperatures for a certain length of time or heated at a significantly higher temperature (Curie temperature)