GEOLOGY

Detailed explanation-1: -A: Jarring or heating a magnet moves the magnetic domains out of alignment. When the magnetic domains no longer line up in the same direction, the material is no longer magnetic.

Detailed explanation-2: -When the external field is removed, the domain walls remain pinned in their new orientation and the aligned domains produce a magnetic field. This is what happens when a piece of ferromagnetic material is “magnetized” and becomes a permanent magnet.

Detailed explanation-3: -If a magnet is exposed to high temperatures, the delicate balance between temperature and the domains in a magnet are destabilized. At around 80 °C, a magnet will lose its magnetic force and it will become demagnetized permanently if exposed to this temperature for a period, or if heated above its Curie temperature.