"[1]
[Footnote 1: The rule for telling which face of the magnetic shell (or
of the loop circuit) is north and which south in its magnetic properties
is the following: If as you look at the circuit the current is flowing
in the same apparent direction as the hands of a clock move, then the
face you are looking at is a south pole. If the current flows the
opposite way round to the hands of a clock, then it is the north pole
face that you are looking at.]
Since the circuit through which the current is flowing has these
magnetic properties, it can attract other magnets or repel them
according to circumstances.
[Illustration: Fig. 10.]
If a magnet be placed near the circuit, so that its north pole, N, is
opposite that side of the circuit which acts as a south pole, the magnet
and the circuit will attract one another. The lines of force that
radiate from the end of the magnet, curve round and coalesce with
some of those of the circuit. It was shown by the late Professor
Clerk-Maxwell, that every portion of a circuit is acted upon by a force
urging it in such a direction as to make it inclose within its embrace
the greatest possible number of lines of force.
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