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//Calculate the force in Newtons between a pair of Sodium positive ion and Chloride negative ion in vacuum and in water
//Example 8.5
clc;
clear;
QNa=1.602*10^-19; //Charge on the Na ion in C
QCl=-1.602*10^-19; //Charge on the Cl ion in C
Epsio=8.854*10^-12; //Permittivity of the vacuum in C^2 N^-1 m^-2
r=1*10^-9; //Distance between ions in m
F1=(QNa*QCl)/((4*%pi*Epsio)*(r)^2); //Force in between a pair of ion in N
printf("(a)Force Between ions in vacuum = %.2f*10^-10 N",F1*10^10);
Epsi=78.54; //Dielectric constant of water
F2=(QNa*QCl)/((4*%pi*Epsio*Epsi)*(r)^2); //Force in between a pair of ion in water in N
printf("\n(b)Force between ions in water = %.2f*10^-12 N",F2*10^12);
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