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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 4-3
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+Z = 700 ; // no. of conductors
+d = 24 ; // diameter of the armature of the dc motor in inches
+l = 34 ; // axial length of the coil in inches
+B = 50000 ; // Flux density in lines/sq.inches
+I = 25 ; // Current carried by the coil in A
+
+// Calculations
+F_av = ( B * I * l * 10 ^ -7 ) / 1.13 * ( 700 * 0.7 ) ; // average force 
+// developed on each coil side in  lb
+r = d / 2; // radius of the coil in inches
+T_av = F_av * ( r /12 ) ; // armature average torque in lb-ft
+
+// Display the results
+disp("Example 4-3 Solution : ")
+printf("\n a : Fav = %.2f lb ", F_av );
+printf("\n b : Tav = %.2f lb-ft ", T_av );