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Mar 19, 2020 at 17:23 vote accept creillyucla
Mar 19, 2020 at 17:23 comment added creillyucla Ok I see. It was not clear to me that the constraint forces should always oppose the net force (which is non-zero) exerted by the point charge. However, motion would require rotation but the net torque exerted by the point charge is zero. Also the potential energy is clearly constant as you move the dipole around the circle.
Mar 19, 2020 at 16:59 history answered mike stone CC BY-SA 4.0