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# Two charges –q and +q are located at points (0, 0, –a) and (0, 0, a), respectively. Obtain the dependence of potential on the distance r of a point from the origin when r/a >> 1.

2.21 Two charges –q and +q are located at points (0, 0, –a) and (0, 0, a), respectively.

(b) Obtain the dependence of potential on the distance r of a point from the origin when  $\frac{r}{a}>>1$

$V\propto \frac{1}{r^2}$