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## Homework Statement

Two arbitrarily thin concentric coplanar rings of radius a and 2a carry uniformly distributed charge density -Q

_{e}and [tex]\sqrt{27}[/tex]Q

_{e}, respectively.

Assuming that Z axis coincides with the rings' axes, and that the plane of the rings correspond to z=0, determine the location of all points of equilibrium(ie zero E field).

## Homework Equations

## The Attempt at a Solution

Need some hint.