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Electromagnetism
The current magnetises
the iron core and creates a pair of magnetic poles, one North, and
the other South. The two compass needles consequently point in opposite
directions. (You may repeat the experiment by clicking on the switch again).
This magnetic field would be created whether we had the iron core in
the middle or not. But the iron core makes the magnetic field much more
powerful.
The iron core may be shaped e.g. like a horse shoe, or a C, which
is a design used in generators.
Generators usually have several North - South pole pairs.
For now, let's see how electromagnetism can work "in reverse"
on the next page on induction.
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