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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 : 2.1
+
+clear ; clc ; close ; // Clear the work space and console
+
+
+// GIVEN DATA
+
+A = 0.0001; // The Cross-sectional area of core in metre-square
+Mo = 4*%pi*(10)^(-7); // Permeability of air in Henre/metre
+Mr = 1000; // Relative permeability of core
+N1 = 10;N2=20;N3=10; // Number of turns
+I1 = 1.0;I2=0.5;I3=1.5; // Currents in Amphere
+d = 2.5; // Dimension of inner window in centimetre
+w = 1.0; // Each limb wide in centimeter
+
+
+// CALCULATIONS
+
+F = (N1*I1)+(N2*I2)-(N3*I3); // MMF in Amphere-turns (minus because third coil produces the flux in opposite direction to that of other to coils)
+L = ((d*4)+(I2*2*4))*10^-2; // Length of the Magnetic path in metre (4-is sides of the windows)(2-Going and returning of current I2)
+R = L/(Mr*Mo*A); // Reluctance of the Magnetic path in MKS unit of Reluctance
+phi = (F*10^3)/R; // Flux in milli-Weber
+B = phi/A; // Flux Density in Weber/metre Square
+H = F/L; // Magnetic Field Intensity in Amphere-turns/Metre
+
+
+// DISPLAY RESULTS
+
+disp("EXAMPLE : 2.1 : SOLUTION :-") ;
+printf("\n (a) Flux in the core, phi = %.6f mWb ,\n",phi);
+printf("\n (b) Flux Density in the core, B = %.2f Wb/metre square \n",B);
+printf("\n (c) Magnetic Field Intensity in the core, H = %.2f At/m \n",H);