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ConceptPotential Energy in an External Field - Potential Energy of a Dipole in an External Field

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#### Question

Figure 2.34 shows a charge array known as an *electric quadrupole*. For a point on the axis of the quadrupole, obtain the dependence of potential on *r *for *r*/*a *>> 1, and contrast your results with that due to an electric dipole, and an electric monopole (i.e., a single charge).

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