The correct spelling of "silinoid" is "solenoid". A solenoid is a tightly wrapped helical coil. They are usually found in cars.
What is solenoid?
Solanoids and electromagnets are not technically identical, but people talk like they are. A solenoid is a coil of wire, but when you pass an electric current through it, you create an electromagnet. Since this is the spool of the most useful wire application, when you pronounce the word "solenoid" it is not surprising that people think that your lens is electromagnetic. Electromagnets are especially useful because, unlike ordinary magnets, they can be turned on and off and the current flowing through them can be amplified.
How do electromagnets work?
Slow charge sits on his sofa and surrounds himself with electric field while doing nothing. This is understandable, since it is the first and foremost electric charge. But once this charge receives a pulse and goes around the block, it suddenly generates a magnetic field. It can make you feel weird and you can never be alone! As physicists later discovered, two fields are part of the same force of nature: electromagnetism.
Because of this, we can make a magnet by applying current through a wire. When we conduct current through a solenoid, we get a very strong magnet because the magnetic field is concentrated inside the coil. It is very useful in our daily life.
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