Teaching Minds-On Experiments on Electromagnetism in Secondary Schools
Magnetic rafts. Distance in magnetic interactions
magnets are placed upon two small polystyrene rafts floating on water.
If we bring the north pole of one of the magnets near to the south pole
of the other, we observe that the magnets attract each other. If we
bring together the same type of poles (north – north or south – south)
we observe that the magnet, which is able to move rotates 180 degrees
in order to attach itself to the opposite pole of the other one.
Distance influences the interaction between magnets. The further away
the magnets are, the weaker their attraction is, until the point that
they are not able to come closer, even when placed on rafts floating on
water. When the magnets are close enough the attraction is strong: they
attract until they touch.
© University of Udine