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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 4-2
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+d = 18 ; // diameter of hte coil in inches
+l = 24 ; // axial length of the coil in inches
+B = 24000 ; // Flux density in lines/sq.inches
+I = 26 ; // 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 * 10 ^ -7 ) / 1.13 ; // force developed on each coil side in  lb
+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 inches
+T_c = f * ( r * 1 / 12); // torque developed in lb.ft/conductor
+
+// Display the results
+disp("Example 4-2 Solution : ")
+printf("\n a : F = %.3f lb ", F );
+printf("\n b : f = %.2f lb ", f );
+printf("\n c : Tc = %.3f lb-ft/conductor ", T_c );