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26
Force
Magnetic
and
Magnetic Fields
You've probably been asking yourself what the iron powder in
the plastic box is for. You will be amazed. You can use the
powder to make a magnet's force visible, since the powder
accumulates wherever the magnetic force is strongest.
What's going on with the pretty iron powder patterns, what do
their lines of force mean, and what do those lines have to do
with Earth? You will learn about all these things and more in
this chapter.
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