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Re: superposition



=20
Does anyone have a good example of some force which does NOT obey the=20
superposition principle, and a simple way of describing it? I think=20
that people (including myself) tend to think that superposition (i.e.=20
that E-fields obey the superposition principle) is obvious. For that=20
reason it is useful to explain how and why something might not obey=20
such a principle, i.e. that it is by no means obvious that all forces=20
should obey it.
=20
You may consider a ferromagnet with a great histeresis area
together with the B field of f.i. a solenoid. The resulting
B field won=ABt be just the sum. the constituent eqs introduce
a highly non-linear term which makes that happen.

M.A.Santos
msantos@etse.urv.es