Chapter 17, Problem 13P

* Salt crystal Four ions $\left({\text{Na}}^{\text{+}},{\text{Cl}}^{\text{-}},{\text{Na}}^{\text{+}},{\text{and Cl}}^{\text{-}}\right)$ in a row are each separated from their nearest neighbor by $3.0\times {10}^{-10}$

m. The charge of a sodium ion is + e and that of a chlorine ion is –e. Determine the electric force exerted on the chlorine ion at the right end of the row due to the other three ions.