schoolscienceproject.blogspot.in
Electro magnet
Wind one to two
yards of thin insulated wire on to an iron bolt and connect the bare ends of
the wire to a battery. The bolt will attract all sorts of metal objects. The
current produces a field of force in the coil. The tiny magnet particles in the
iron become arranged in an orderly manner, so
that the iron
has a magnetic north and South Pole. If the bolt is made of soft iron, it loses
its magnetism when the current is switched off, but if it is made of steel it
retains it.
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