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//Example number 7.8, Page number 149
clc;clear;
close;
//Variable declaration
epsilonr=4; //relative dielectric constant
Na=2.08*10**23; //avagadro number
epsilon0=8.85*10**-12;
//Calculation
x=(epsilonr-1)/(epsilonr+2);
alpha_e=x*3*epsilon0/Na; //electronic polarisability(Fm**2)
//Result
printf("electronic polarisability is %.3e Fm^2",alpha_e)
//answer in the book is wrong
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