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A fundamental property of matter which causes it to experience electromagnetic forces.

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

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. … This means that no work would be done on a test charge that moves along the path of the perpendicular bisector (since the field is always perpendicular to this test charge) …
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