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this is perhaps the simplest motor on earth. you will require some magnets, a battery,
insulated copper wire, some rubber bands. take 1.5m of insulated copper wire and wind
it round and round over the battery. make 10 or 12 turns and then remove it like a spring.
take one end and tie a knot and stretch it out. do the same thing on the other end. both
these ends will be in line with the center of the coil. they will be along the diameter
so that there is equal distribution of weight. with the scissors trim both these ends so
that they are just 3cm long. the coil is almost ready but not quiet. now take a knife and
scrape out the insulation on three sides on one end. one side will still remain insulated.
on the other side scrape the insulation on all four sides and there will be all copper
on this side. this is like a brush for the commutator. now take 1cm broad rubber bands
from old bicycle tube. stretch it on the battery, one across and one along its cylinder. place
a ferrite magnet in one of the rubber bands. take two safety pins and fix them on the two
ends so that they touch the plus and minus of the battery. the motor is ready now. this
is the picture which depicts the brushes more clearly. take the coil and place it in the
two holes of the safety pin and give the coil a little flip. and it would start spinning.
it is amazing to see this motor spin. if you bring another magnet on top, you could see
some times the coil spins must faster. if they are opposite poles it spins much faster.
if you reverse the magnets there will be similar poles, both north or both south, and in this
case the coil just slows down. take the coil and fan it out to make an egg shape. put it
again inside the motor and this oval shaped coil also spins very fast. you can try various
shapes and sizes of coils. you can do another experiments with this motor. on one single
battery this motor works for 3 hours. its perhaps the simplest motor on earth.