Page 116 - York Global Science 6 - Physical Science
P. 116
How does electromagnetism work?
When electrons move along a wire, the movement of the charged particles
makes a magnetic field.
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When a wire is shaped as a coil, the flow of electrons through the coil
produces an even stronger magnetic field because the electric current is all in
one place.
When there is no electric current flowing through the wire, the magnetic field
goes away.
You can use a switch to stop and start electric current flowing through a wire.
If you stop the electric current, the
magnetic field is also turned off. When
you turn the electric current back on, the
magnetic field comes back. This means
that the force can be stopped and
started easily, which is very useful.
Some machines use large
electromagnetic forces.
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