robbering folder (magnetic door alarm)

welcome back to war. Wednesday, 21.30 pm! Magnetic door alarm!
Curie Point- When a piece of iron gets too hot, it loses its attraction to a magnet.

https://www.exploratorium.edu/snacks/curie-point

EXPLORATORIUM.EDU

Curie Point

A piece of iron ordinarily will be attracted to a magnet, but when you heat the iron to a high enough temperature (called the Curie point), it loses its ability to be magnetized. Heat energy scrambles the iron atoms so they can’t line up and create a magnetic field—this Snack is a simple demonst...