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+
+clc
+//Given that
+alpha_e = 2e-40 // Electronic polarisability in Fm^2
+N = 4e28 // density in atoms/m^3
+epsilon_0 = 8.85e-12 // Permittivity of free space
+
+printf("Example 4.9")
+epsilon_r = 1+ N*alpha_e/(epsilon_0) // Calculation of relative permittivity
+printf("\n Relative permittivity is %f\n\n\n",epsilon_r)
+
+
+