Because it is. Gravitational potential energy is energy stored
in the gravitational field, electrical potential energy is energy
stored in the electric field, magnetic potential energy is stored
in the magnetic field, etc.
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lU=-mB Metal
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neither. they separate because of magnetic fields. its not
kinetic. its not potential. If you hold them together.. the "push"
of them trying to get apart is storing some potential energy.. kind
of like a spring. I guess you'd call it elastic potential energy
because i dont know if there is such a thing as magnetic potential
energy... hmm..