Some of the commonly known ideas regarding magnetism are:
(i)
The earth behaves as a magnet with the magnetic field pointing
approximately from the geographic south to the north (ii) When a bar magnet is freely suspended, it points in  the north-south
direction The tip which points to the geographic north is called the
north pole and the tip which points to the geographic south is called
the south pole of the magnet Chapter Five
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MATTER
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Magnetism and
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(iii) There is a repulsive force when north poles ( or south poles ) of two
magnets are brought close together