Magnetism
Everyone knows when some metals become close together, they tend to attract and stick to one another. But then if you rotate one to a different end they repel. Weird stuff, right? It's sure fun to play with. Well, that's magnetism for you.
(5*) Magnetism is a very
weird topic but its an important concept for much of our current technology.
After all, without it humans would not have a majority of
anything we have today.
Magnetism can be
found or even created, often in a large variety of ways. Below is an
example of how magnetism can be created. The arrows
represent the direction of the magnetic field along the
field lines. This concept is the basis for much of our (6*)
technology.
As a current passes through the coils,
it induces a magnetic field from the charges flowing along
the wires. Coils are often stacked as shown to amplify the
effect and create much stronger magnetic fields. An
important piece of technology that uses this effect is a
Magnetic Resonance Imaging (MRI) machine which is used in
the medical field.