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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 : 7.2 :
+// Page number 211
+clear ; clc ; close ; // Clear the work space and console
+
+// Given data
+R = 495.0*10**6      // Insulation resistance(ohm/km)
+d = 3.0              // Core diameter(cm)
+rho = 4.5*10**14     // Resistivity of insulation(ohm-cm)
+
+// Calculations
+l = 1000.0                               // Length of cable(m)
+r_2 = d/2.0                              // Core radius(cm)
+Rho = rho/100.0                          // Resistivity of insulation(ohm-m)
+r1_r2 = exp((2*%pi*l*R)/Rho)             // r1/r2
+r_1 = 2*r_2                              // Cable radius(cm)
+thick = r_1-r_2                          // Insulation thickness(cm)
+
+// Results
+disp("PART II - EXAMPLE : 7.2 : SOLUTION :-")
+printf("\nInsulation thickness = %.1f cm", thick)