Remagnetising school magnets
Scholastic physics collectionsEspecially physics teachers will appreciate this application "Revival of old school magnets": Many physics collections in schools contain magnets that have lost their adhesive force over time. Buying new ones would be expensive, but you can use small and affordable super magnets to revive the old ones. How that works is explained below:
An amazing measurementA quick measurement confirms: Instead of the original 14 mT the magnet now has more than 306 mT. Mission accomplished!
Due to the dangers of chipping, advise your pupils to not let the magnets collide.