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They are called permanent magnets. These magnets retain their magnetic field without the need for any external power source or force to maintain them.
I dont think you can ---- If you super-heat the magnets, it will demagnetize them, thus stopping the "pulling power" of the magnets. Basically stick the magnets in a vat of super boiling water, that should be sufficient enough heat to demagnetize the magnets.
because it is bigger than the little magnets and has more power than the little magnets do.
permanent magnets
To find out how much it will cost to mail refrigerator magnets in bulk call the local post offices. They will have all the information need. The price will depend on the weight and distance.
With magnets
By rubbing two magnets together.
Industrial strength magnets are used widely for lifting, work holders,and chucks.
No, not all magnets have the same power. The strength of a magnet is determined by its magnetic field, which can vary depending on factors like the material it's made of and its size. Magnets can range from weak refrigerator magnets to strong neodymium magnets.
permanent magnets
Cold. If magnets get overheated, they can cease to work all-together.
magnets help us because magnets can help power your refrigerator.