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Essay text:
Experiment shows that an induced emf always gives rise to a
current whose magnetic field opposes the original change in flux. This is known
a Lenz's law. Let us apply it to the case of relative motion between a magnet
and a coil. The changing flux induces an emf, which produces a current in the
coil; and this induced current produces its own magnet field. If the distance
between the coil and the magnet decreases; so the magnetic field, and therefore
the flux, through the coil increases. The magnetic field of the magnet points
upward. To oppose this upward increase, the field produced by the induced
current must point downward...
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