Browse Questions

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).

Can you answer this question?

For a dipole, $V \alpha \large\frac{1}{r^2}$
For a monopole, $V \alpha \large\frac{1}{r}$