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+// chapter 7

+// example 7.9

+// calculate polarisability due to permanent dipole moment and due to deformation of the molecules

+// page 190-191

+clear;

+clc;

+// given

+alpha1=2.5E-39; // in C^2-m/N (dielectric constant at 300K)

+alpha2=2.0E-39; // in C^2-m/N (dielectric constant at 400K)

+T1=300; // in K(first temperature)

+T2=400; // in K(second temperature)

+//calculate

+// since alpha=alpha_d+alpha0 and alpha0=Beta/T

+// therefore alpha=alpha_d+(Beta/T)

+// since alpha1=alpha_d+(Beta/T1)  and alpha2=alpha_d+(Beta/T2)

+// therefore alpha1-apha2=Beta*((1/T1)-(1/T2))

+// or Beta= (alpha1-apha2)/ ((1/T1)-(1/T2))

+Beta= (alpha1-alpha2)/ ((1/T1)-(1/T2)); // calculation of Beta

+alpha_d=alpha1-(Beta/T1); // calculation of polarisability due to defromation

+alpha0_1=Beta/T1; // calculation of polarisability due to permanent dipole moment at 300K

+alpha0_2=Beta/T2;  // calculation of polarisability due to permanent dipole moment at 400K

+printf('\nThe polarisability due to permanent dipole moment at 300K is \t %1.2E C^2-m/N',alpha0_1);

+printf('\nThe polarisability due to permanent dipole moment at 400K is \t %1.2E C^2-m/N',alpha0_2);

+printf('\n\nThe polarisability due to deformation of the molecules is \t %1.2E C^2-m/N',alpha_d);