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//Example number 7.7, Page number 148
clc;clear;
close;
//Variable declaration
epsilonr=1.0000684; //dielectric constant
Na=2.7*10**25; //number of atoms
x=1/(9*10**9);
E=10**6; //electric field(V/m)
e=1.6*10**-19; //charge(c)
Z=2; //atomic number
//Calculation
r0=((epsilonr-1)/(4*%pi*Na))**(1/3); //radius of electron cloud(m)
X=x*E*r0**3/(Z*e); //displacement(m)
//Result
printf("radius of electron cloud is %.2e m",r0)
printf("\n displacement is %.4e m",X)
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