Electromagnets are temporary magnets which have a magnetic field only when current passes through them. Some everyday applications of electromagnets include generators, motors, microphones, loudspeakers and cranes. Electromagnets are also used in scientific equipment such as particle accelerators, mass spectrometers and NMR (Nuclear Magnetic Resonance) spectrometers.Continue Reading
Electromagnets are constructed by passing current through a coil of wire that may be wound around a central metal core. When current passes through the coil, it acts like a magnet and the magnetic field can be turned on or off with the current. The direction of the magnetic poles can also be reversed by reversing the direction of current.
Maglev trains work using electromagnets to hover the train above the tracks and change the polarity of the electromagnets in the tracks to help the train move forward. Particle accelerators also use electromagnets to accelerate charged particles by rapidly changing the polarity of the magnet.
Electric motors in appliances such as fans use electromagnets to do work. Current from the socket reaches the electromagnet, which moves and does work. Cranes in junkyards use electromagnets to lift scrap metal. When current flows through the magnet, the crane lifts the metal. After moving the metal to the desired location, the current is turned off to drop the metal. Magnetic Resonance Imaging (MRI) machines use electromagnets to capture images of the human body in a non invasive manner.Learn more about Magnetism
Testing different magnets to determine their strength or building a linear accelerator with magnets are some science projects using magnets that are appropriate for children. Experiments such as these are available on HomeTrainingTools.com and Education.com.Full Answer >
The uses of magnets in everyday life include in the household, credit cards, electronics, industrial work, medical equipment and jewelry. In different industrial fields, magnets are useful as magnetic sweepers or sorters. Everyday electronics used in the home, such as televisions, computer disks and videotapes, also require magnetism to produce some type of magnetic field.Full Answer >
Permanent magnets with diminished field strength can be recharged in at least three ways: by striking, stroking or stacking. Each of these methods entails lining up the weakened magnet with a stronger external field and using it to realign its particles.Full Answer >
All magnets have both a north and a south pole, which causes them to either repel or attract one another depending on how the two poles are lined up. If the north pole of one magnet meets the south pole of another, the two will be attracted, but if either both north or south poles meet, the magnets will repel one another.Full Answer >