A small object with electric dipole moment p S is placed
Chapter 26, Problem 52(choose chapter or problem)
A small object with electric dipole moment p S is placed in a nonuniform electric field E S 5 E1x2i ^. That is, the field is in the x direction, and its magnitude depends only on the coordinate x. Let u represent the angle between the dipole moment and the x direction. Prove that the net force on the dipole is F 5 p a dE dx b cos u acting in the direction of increasing field.
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