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+
+                     // Example  7.7
+
+k=1;                  // Constant
+N1=2000;              // turns of Solenoid
+N2=500;               // turns of Coil
+mo=4*%pi*10^-7;       // Permeability of free Space
+A=30*10^-4;           // Area of aCoil 
+l=0.7;                // Length of Solenoid
+z=k*N1*N2*mo*A;       // alphabet for simplicity
+M=z/l;                // Formula of Mutual Inductance
+disp('(a) Mutual induction of a Coil = '+string(M)+' H');
+dit=260;              // Rate of Chenge of Current
+e=M*dit;              // Formula of emf (using Mutual induction)
+disp('(b) emf induced in a Coil is = '+string(e)+' Volt')
+
+
+
+
+      // p232       7.7