An electromagnet is a magnet that runs on electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. The poles of an electromagnet can even be reversed by reversing the flow of electricity. Electromagnets produce a magnetic field only when needed. Due to the versatility and power, electromagnets are suitable for a wide range of uses.
History of Electromagnet:
Electromagnetism was first developed in 1819 by a scientist named Hans Oersted. He discovered that a current-carrying wire sets up a magnetic field. Magnetism and electricity were considered to be two different phenomena before Oersted’s discovery. Using this information, in 1825, a physicist named William Sturgeon produced the first usable electromagnet. Sturgeon also bent the iron core into a U-shape to bring the poles closer together, thus concentrating the magnetic field lines.
It can be turned on and off by cutting of the electrical current.
It does minimal harm to the human body because it’s not using x-rays like (how) an x-ray does.
It is easy to use and it can be helpful in many medical and casual things.
Electromagnetism is the reason why we can toggle on and off things like our house lights for example.
Electromagnetism led to the discovery of the electromagnetic spectrum
How does Electromagnet Work:
Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron, cobalt or nickel; the magnetic core concentrates the magnetic flux and makes a more powerful magnet. Using proper core material, increasing the loops of wire coiled around the core and increasing the electric current traveling through the wires are all the ways to strengthen the electromagnetic field.
Electromagnetism is the combined effect of electricity and magnetism.
Unlike permanent magnets, Electromagnetism can be switched on and off.
Electromagnets are used in everything from ticket machines and telephones to loudspeakers.
Magnetic levitation trains use very strong electromagnets to carry the train on a cushion of magnetic repulsion.
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