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MAGNETS AND MAGNETISM 9

the needle. If the lower end of the needle happens to
be a south pole it will be attracted by the north pole
of the bar magnet. If, on the other hand, it is a north
pole, it will be repelled and you cannot touch it with
the north pole of the bar magnet unless you catch it and
hbld it.

This fact gives rise to the general law of magnetism:
Like poles repel each other and unlike poles attract each other.

‘I’IIIA.

III“.

   

Luke Pol“ Unlike Pole.

 

FIG. 10. — An Experiment Illustrating that Like Poles Repel Each
Other and Unlike Poles Attract.

Another interesting way of illustrating this same law is
by making a small boat from cigar-box wood and laying a
bar magnet on it. Place the north pole of the bar magnet
in the bow of the boat. .

Float the boat in a basin of water. Bring the south pole
of a second magnet near the stern of the boat and it will

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