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When electric current flows through a wire, it produces a magnetic field. We can use this knowledge to create electromagnets. An electromagnet is a magnet that attracts magnetic materials thanks to the electric current passing through it.
Electromagnets are typically made by wrapping wire around a magnetic material such as iron or steel. Each coil around the magnetic object increases the strength of the magnetic field.
Electromagnets are particularly useful because the magnetic property can be easily turned on and off by controlling the flow of electric current. Many devices and appliances we use contain electromagnets. They are found in speakers, electric bells, electric motors, computer hard drives and MRI machines.
Strength of electromagnets
A number of factors can affect the strength of the magnetic field produced by an electromagnet. One way to increase the strength of an electromagnet is to increase the number of coils of wire. The more coils of wire, the stronger the electromagnet.
A coiled wire alone will always create an electromagnet. However, wrapping the wire around a magnetic material increases the strength of the electromagnet.
We can also increase the strength of an electromagnet by adding more batteries in series. An electromagnet with two batteries in series will have a stronger magnetic field than an electromagnet with a single battery.
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