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Use this tag for questions regarding electric or magnetic dipoles, meaning a field on an object with a north and south pole or two point charges of equal magnitude.

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Why is the potential energy of a dipole in an electric field zero when the dipole points per...

Another way to think about this problem is to consider the direction of the electric field along any point along the perpendicular bisector of the line between the dipole. … It is, in fact, purely in the direction of the dipole (i.e. a test charge would repel from the positive end and go to the negative end) and it is 0 in the direction of this perpendicular bisector. …
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