Magnets are used in computer data storage, compasses, doorbells and alarm systems, microphones and speakers, motors, electrical generators and electrical transformers. They are also used to levitate objects, including trains that operate via magnetic propulsion. Naturally occurring magnetism protects the Earth from cosmic radiation.
Magnets are also used in a variety of medical and veterinary applications. Magnetic resonance imaging uses magnetic fields to view internal organs, and electromagnetic fields promote the healing of broken bones. A similar treatment prevents bone loss in astronauts outside of Earth's gravity.
In veterinary medicine, magnets are used to treat hardware disease in cows. The condition occurs when cows swallow metal objects, which can puncture their organs. Cows can be fed magnets as a preventative; any metal objects swallowed will be drawn to the magnet instead of puncturing the cow's stomach. Magnets can also be used to ensure cows' feed is clear of metal objects before ingestion. Unlike in cows, swallowing magnets is a medical emergency for humans; they can perforate the intestines.
Other medical uses for magnets, such as applying magnets topically to treat pain, are not proven by scientific studies. Magnetized drinking water is similarly unproven; scientific studies show no evidence that it has any health benefits.Learn More
A repulsive force arises between two charged objects having the same charge polarity. Like-positive charges and like-negative charges repel one another. Meanwhile, opposite charges attract.Full Answer >
The spectrum of electromagnetic radiation is comprised of waves or particles that carry different amounts of energy. The visible spectrum is what humans and most animals see. The least energetic range of electromagnetic radiation is radio. Next is microwave radiation followed by infrared, visible, ultraviolet, x-ray and gamma-ray.Full Answer >
To make a magnetic levitation car, first carve a polystyrene block into the shape of a car and glue magnets on the bottom with the negative side facing down, then create the track by gluing magnets with the negative side facing up. The magnets will repel from each other and keep the polystyrene car levitated above the track.Full Answer >
An electromagnetic crane uses magnetism to pick up and move objects, as opposed to a pincer or claw used by more traditional cranes, which makes it ideal for any lifting tasks involving metal. Electromagnetic cranes are often used in recycling plants or scrap yards due to the high amounts of metal that need to be moved.Full Answer >