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+// A Texbook on POWER SYSTEM ENGINEERING
+// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
+// DHANPAT RAI & Co.
+// SECOND EDITION 
+
+// PART II : TRANSMISSION AND DISTRIBUTION
+// CHAPTER 7: UNDERGROUND CABLES
+
+// EXAMPLE : 7.1 :
+// Page number 211
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+d = 2.5              // Core diameter(cm)
+t = 1.25             // Insulation thickness(cm)
+rho = 4.5*10**14     // Resistivity of insulation(ohm-cm)
+l = 10.0**5          // Length(cm)
+
+// Calculations
+D = d+2*t                        // Overall diameter(cm)
+R_i = rho/(2*%pi*l)*log(D/d)     // Insulation resistance(ohm)
+
+// Results
+disp("PART II - EXAMPLE : 7.1 : SOLUTION :-")
+printf("\nInsulation resistance per km, R_i = %.2e ohm\n", R_i)
+printf("\nNOTE: ERROR: Mistake in final answer in textbook")