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+//Example number 7.10, Page number 149
+
+clc;clear;
+close;
+
+//Variable declaration
+epsilon0=8.85*10**-12;    
+N=2.7*10**25;   //density of atoms
+R=0.55*10**-10;    //radius(m)
+//Calculation
+alpha_e=4*%pi*epsilon0*R**3;     //polarisability(Fm**2)
+epsilonr=(N*alpha_e/epsilon0)+1;     //relative permittivity
+//Result
+printf("polarisability is %.3e Fm^2",alpha_e)
+printf("\n relative permittivity is %.7f Fm^2",epsilonr)