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+//=====================================================================================
+//Chapter 13 example 7
+
+clc;clear all;
+
+//variable declaration
+R1  = 180;     //resistance in Ω
+R2  = 20;     //resistance in Ω
+A   = 0.005;     //area in m^2
+Ns   = 1000;       //number of turns on search coil 
+G1   = 100*10^-6;    //galvanometer constant C
+G2   = 100;           //galvanometer throw
+
+//calculations
+Rs   = R1+R2;      //total resistance of secondary circuit in  Ω
+Q    = G1*G2;     //charge passed through ballistic galvanometer in C
+//Q  = i*t  = (E/Rs)*t  = ((2*phi*Ns)/(t*Rs))*t = (2*phi*Ns)/Rs
+phi  = (Q*Rs)/(2*Ns);     //flux in Wb
+B   = phi/(A);        //flux density in Wb/m^2
+
+//result
+
+mprintf("flux density = %3.2f Wb/m^2",B);
+