$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$

$\frac{1}{4{\in }_c} \frac{Q}{r}$

$4\mathrm{\pi }{\in }_0\mathrm{r}$

$4\mathrm{\pi }{\in }_0{\mathrm{r}}^2$

$\frac{1}{4\mathrm{\pi }{\in }_0{\mathrm{r}}^2}\frac{\mathrm{Q}}{{\mathrm{r}}^2}$