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+// Example 2.5//
+
+rna=0.098;//nm // Ionic radius of Sodium (From appendix 2)
+rcl=0.181;//nm // Ionic radius of Cholrine (From Appendix 2)
+a0=rna+rcl
+mprintf("a0 = %f nm",a0)
+k0=9*10^9;//V m/C //Proportionality constant
+z1=0.16*10^-18;//C //coloumb //valence of charged ion
+z2=0.16*10^-18;//C //coloumb //valence of charged ion
+q=1;// charge of single electron
+q1=-1;//charge of single electron
+a1=0.278*10^-9;//nm// separation distance between the centers of th ions
+FC=-(k0*q*z1*q1*z2)/(a1^2)
+mprintf("\nFC = %e N",FC)
+// Nothing that 1V C=1J, we obtain
+
+//(b) Because FC+FR =0
+FR=-FC
+mprintf("\nFR = %e N",FR)