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+//Problem 7.11: A closed magnetic circuit of cast steel contains a 6 cm long path of cross-sectional area 1 cm2 and a 2 cm path of cross-sectional area 0.5 cm2. A coil of 200 turns is wound around the 6 cm length of the circuit and a current of 0.4 A flows. Determine the flux density in the 2 cm path, if the relative permeability of the cast steel is 750.
+
+//initializing the variables:
+A1 = 1E-4; // in m2
+A2 = 0.5E-4; // in m2
+l1 = 0.06; // in m
+l2 = 0.02; // in m
+N1 = 200; // no. of turns about 6 cm coil
+I = 0.4; // in Amperes
+u0 = 4*%pi*1E-7;
+ur = 750;
+
+//calculation:
+//Reluctance 
+S1 = l1/(u0*ur*A1) // for 6 cm
+S2 = l2/(u0*ur*A2) // for 2 cm
+St = S1 + S2
+Phi = N1*I/St
+B2 = Phi/A2
+
+printf("\n\nResult\n\n")
+printf("\n flux density in the 2 cm path = %.2f T\n",B2)
+\ No newline at end of file