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the opposite kind of polarity in that end of
the magnet next to it. An artificial magnet
may be made by taking a piece of steel and
sinking it with the north pole of the magnet
from the centre towards one end, and with the
South pole from the cente forwards the other end.
The difference that the magnetic needle points
either East or West of north is called its declination
and the changes in the above are the
variations, we only know the variations by
observation. Barlows chart is the best to point
out the variations, Magnetic attraction and
repulsion is as the square of the {aistance?} and
the extent of surface . the {dip?} of the neeedle is
its {variahins?} vertically which increases as we
go north , there is no theory that {satisfactoral?}
explains magnetism it appears as if {ion?} .
nickel and cobalt are now conducters and
this means we {ascertecin?} its properties.
Magnetism may be gravity as matter can {mo?}
act an matter with out some medium