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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 4: DC Dynamo Torque Relations-DC Motors
+// Example 4-15
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+I_a_orig = 25 ; // Original armature current in A
+I_a_final = 30 ; // Final armature current in A
+T_orig = 90 ; // Original torque developed in lb.ft
+phi_orig = 1.0 ; // Original flux
+phi_final = 1.1 ; // Final flux
+
+// Calculations
+T_a = T_orig * ( I_a_final / I_a_orig ) ^ 2 ; // Final torque developed if field
+// is unsaturated
+T_b = T_orig * ( I_a_final / I_a_orig ) * ( phi_final / phi_orig ) ; 
+// Final torque developed when Ia rises to 30 A and flux by 10%
+
+// Display the results
+disp(" Example 4-15 Solution : " );
+printf(" \n a: T = %.1f lb-ft \n ", T_a );
+printf(" \n b: T = %.1f lb-ft ", T_b );