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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 4-6
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+T_old = 150 ; // Torque developed by a motor in N-m.
+disp("Example 4-6")
+disp("Given data : ")
+printf("\n \t\t\t phi \t I_a \t T ");
+printf("\n \t\t\t ________________________");
+printf("\n Original condition \t 1 \t 1 \t 150 N-m ");
+printf("\n New condition \t\t 0.9 \t 1.5 \t ? ");
+
+// Calculation
+T_new = T_old * ( 0.9 / 1 ) * ( 1.5 / 1 ) ; // New torque produced in N-m
+
+// Display the result
+printf("\n\n Solution : ")
+printf("\n Using the ratio method, the new torque is the product ");
+printf("\n of two new ratio changes : ");
+printf("\n T = %.1f N-m ", T_new );