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A better convention (more general) is to say that the end of a magnet
from which the field lines are emerging is N while the end toward which
they are converging is S. How can one tell? By watching the compass. The
S to N segment of the needle coincides with the direction of B.
If you really want to talk about something interesting, we might try to
make some sense out of the generation of the earth's magnetic field.
Yes, I know, it is supposed to be some type of self-excited generator
making large currents which generate the field. That really doesn't
help me much.