Electric quadrupole Figure shows an electric quadrupole. It consists of two dipoles with dipole moments that are equal in magnitude but opposite in direction. Show that the value of E on the axis of the quadrupole for a point P a distance z from its center (assume z >> d) is given by E = 3Q/4??₀z⁴ in which Q (= 2qd²) is known as the quadrupole moment of the charge distribution.

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