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make a wooden stand
with a height of
about one and half feet
and a hook at the top
to hang a thread
take a strong neudynamic magnet and stick it to
a washer
and attach a long thread to a washer
the magnet do not stick to the aluminium plate. it
just falls off
hang the magnet
from the hook
and swing it freely
the magnet will oscillate
to and fro very freely
then take an aluminium plate
and place it
below the magnet
once again swing the magnet
and because of the eddy currents the magnet
will come to a very quick halt. it stops
very quickly. now
with no plate the magnet swings freely
once you put
one aluminium plate
it stops
but slowly
now you put another aluminium plate
which reduces the air gap
and if you swing the magnet now
the magnet stops much faster
the braking is much much faster
this braking is because of eddy currents