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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD
+
+// CHAPTER : 7 : SPECIAL MOTORS AND INTRODUCTION TO GENERALIZED MACHINE THEORY
+
+// EXAMPLE : 7.13
+
+clear ; clc ; close ; // Clear the work space and console
+ 
+
+// GIVEN DATA
+
+L1 = 1.1;                                               // Inductance in Henry
+L2 = 1.07;                                              // Inductance in Henry
+dtheta = 1;                                             // Rotor rotation in Mechanical degree
+r = 0.10;                                               // Radius of the rotor in Meter
+I = 20;                                                 // Coil Current in Amphere
+
+
+// CALCULATIONS
+
+dl = L1-L2;                                             // Change in Inductance of one of its stator coils in Henry
+F = (I^2*dl)/(2*dtheta);                                // Force on the single rotor pole in Newton
+T = F*r;                                                // Instantaneous Torque in Newton-meter
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 7.13: SOLUTION :-");
+printf("\n (a) Instantaneous Torque, T = %.1f N-m \n\n",T)
+printf("The force is a motoring force since inductance of the coil is rising")