Orientation for the lowest energy

[Jef Vermeiren]

For alpha >0 I expect the energy to reach a minimum when the dumbbell is oriented parallel to the z-axis.
For alpha = 0 the enrgy will not depend on the orientation of the dumbbell.
For alpha < 0 I think the energy will reach a minimum if the dumbbell is oriented perpendicular to the z-axis.

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