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+
+// ELECTRICAL MACHINES
+// R.K.Srivastava
+// First Impression 2011
+// CENGAGE LEARNING INDIA PVT. LTD 
+
+// CHAPTER : 2 : FORCES IN AN ELECTROMAGNETIC SYSTEMS
+
+// EXAMPLE : 2.5 
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+// Refer figure 2.3(a):- Page no. 36
+
+B = 1.0;                    // Flux Density in the Core in Weber/Meter-Square
+Liron = 0.55;               // Mean length of the flux path of Iron in Meter
+Lair = 0.002;               // Mean length of the flux path of Air Gap in Meter
+I = 20;                     // Coil Current in Amphere
+H = 200;                    // Field Intensity in Amphere-Turns/Meter
+mue_r = 20000;              // Relative permeability of Ferrite core
+mue_0 = 4*%pi*10^-7;        // Permeability of the air in Henry/Meter
+a = 0.0025;                 // Area of the Cross sectional of the core oin Metre-Square
+
+
+// CALCULATIONS 
+
+phi = B*a;                             // Toatl Flux in the core in Weber
+Rair = Lair/(mue_0*a);                 // Relucatnce in the Air gap
+Fair = Rair*phi;                       // MMf in the Air gap in Amphere-Turns
+Firon = H*Liron;                       // MMf in the Iron core in Amphere-Turns
+F = Firon+Fair;                        // Total MMF in Amphere-Turns
+N = F/I;                               // Number of turns in the Coil
+F_new = B/(mue_0*mue_r);               // Field Intensity in Amphere-Turns/Meter
+F_new_total = (Fair+F_new);            // Total MMF in Amphere-Turns
+N_new = F_new_total/I;                 // Number of turns in the Coil
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 2.5 : SOLUTION :-") ;
+printf("\n (a) Number of turns in the Coil in air gap made of Silicon Steel having an field intensity 200At/m corresounds to 1.0 T Flux Density , N = %.2f appoximately 85 \n ",N);
+printf("\n (b) Number of turns in the Coil for a ferrite core of having Relative premeability of 20000 and magnetic Field Density corresponnds to 1.0 T , N_new = %.2f appoximately 82  \n",N_new);