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Figure 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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For a dipole, $V \alpha \large\frac{1}{r^2}$
For a monopole, $V \alpha \large\frac{1}{r}$
answered Jun 23, 2014 by meena.p
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