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A collection of refrigerator magnets A refrigerator magnet displaying a sexual assault hotline's telephone number. A refrigerator magnet or fridge magnet is a small magnet, often attached to an artistic or whimsical ornament, which may be used to post items such as shopping lists, Christmas cards, child art or reminders on a refrigerator door, or which simply serves as decoration.
These so-called ceramic magnets are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30–160 kiloampere turns per meter (400–2000 oersteds). [33] The density of ferrite magnets is about 5 g/cm 3.
Maybe all flexible fridge magnets use the narrow stripe (Halbach array) arrangement of poles (on one face) (all mine do, 4 or 5 mm repeat)), but many solid fridge magnets use circular hard magnets - some of these have alternating poles on the face, and some don't. Many with discs 15 mm diameter (4 mm thick) have a single N or S pole on each face.
Thousands of sets of high-powered magnetic balls sold at Walmart have been recalled after federal regulators issued a warning about the potential risk of choking, serious injuries and death.
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An example of a permanent magnet formed from a ferromagnetic material is a refrigerator magnet. [2] Substances respond weakly to three other types of magnetism—paramagnetism, diamagnetism, and antiferromagnetism—but the forces are usually so weak that they can be detected only by lab instruments.