| DESCRIPTION:
This animation shows the magnetic field of a Helmholtz
coil when the current in the top and bottom coils flows
in opposite directions (ie. their dipole moments are
anti-aligned). The fields from the two point in opposite
directions, creating a net field that is zero at the
center of the coils. Though the coils are fixed, they
are repelled from one another, resulting in a pressure
in the field between them. This is illustrated by fieldlines
as they are compressed along the central horizontal
axis between the coils.
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