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+//chapter 7
+//example 7.5
+//Calculate the electronic polarisability of sulphur
+//page 189
+clear;
+clc;
+//given
+Er=3.75; // di-elecrtic constant of sulphur at 27 degree Celcius
+gama=1/3; // internal field constant
+p=2050; // in Kg/m^3 (density)
+M_A=32; // in amu (atomic weight of sulphur)
+Eo=8.85E-12; // in F/m (absolute permittivity)
+N=6.022E23; // Avogadro's number
+//calculate
+// Since ((Er-1)/(Er+2))*(M_A/p)=(N/(3*Eo))*alpha_e
+// therefore we have
+alpha_e=((Er-1)/(Er+2))*(M_A/p)*(3*Eo/N); // calculation of electronic polarisability of sulphur
+printf('\nThe electronic polarisability of sulphur is \t=%1.2E Fm^2',alpha_e);
+// NOTE: There is slight variation in the answer due to round off