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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 4-1
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+d = 0.5; // diameter of the coil in m
+l = 0.6; // axial length of the coil in m
+B = 0.4; // flux density in T
+I = 25; // current carried by the coil in A
+theta = 60; // angle between the useful force & the interpolar ref axis in deg
+
+// Calculations
+F = B * I * l; // force developed on each coil side in  N
+f = F * sind(theta); // force developed at the instant the coil lies at an angle
+// of 60 w.r.t the interpolar  ref axis
+r = d / 2; // radius of the coil in m
+T_c = f * r; // torque developed in N-m
+T_c1 = T_c * 0.2248 * 3.281 ; // torque developed in lb-ft by first method
+T_c2 = T_c * 0.737562 ; // torque developed in lb-ft by second method
+
+// Display the results
+disp("Example 4-1 Solution : ")
+printf("\n a : F = %d N ", F );
+printf("\n b : f = %.2f N ", f );
+printf("\n c : Tc = %.2f N-m ", T_c );
+printf("\n d : 1.3 N-m * 0.2248 lb/N * 3.281 ft/m = %.2f lb-ft ", T_c1 );
+printf("\n     1.3 N-m * 0.737562 lb.ft/N.m = %.2f lb-ft ", T_c2 );