What will happen to the magnitude of the field energy between them is that
Whenever there is a stored energy in an object at rest, the object will move in the direction that causes the energy stored to decrease, which will be replaced by movement energy.
Therefore, if two magnets with like poles are pointing together, then the energy stored will decrease as they move apart. Hence, as the distance between poles decreases, field energy increases.
Magnetic pole are region at each end of a magnet where the external magnetic field is strongest.
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