WHAT ARE ELECTROMAGNETS? HOW ARE THEY MADE? ARE THEY PERMANENT OR TEMPORARY MAGNETS?
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Answer:
WHAT ARE ELECTROMAGNETS
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
HOW ARE THEY MADE
When an electric current flows in a wire, it creates a magnetic field around the wire. This effect can be used to make an electromagnet . A simple electromagnet comprises a length of wire turned into a coil and connected to a battery or power supply. ... wrapping the coil around a piece of iron (such as an iron nail)
ARE THEY PERMANENT OR TEMPORARY MAGNETS?
Electromagnets: A permanent magnet is a magnet that retains its magnetion. A small permanent magnet can be used to hold notes onto the door of a refrigerator. ... An electromagnet is a temporary magnet which magnetic field is produced by the flow of electric current in a coil wound round a soft iron core.
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An electromagnet is a type of magnet in which the magnetic field is produced by an electric currents.
Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil and it starts behaving like a magnet. The magnetic field disappears when the current is turned off.
hence,it is a temporary magnet