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+//===========================================================================
+//chapter 5 example 12
+clc;clear all;
+
+//variable declaration
+V     = 0.1;            //voltage in V
+R     = 200;            //coil resistance in  Ω
+B     = 0.2;            //flux density in Wb/m^2
+l       = 0.03;         //length in m 
+r      = 0.025;         //width in m
+N    = 100;
+Tc    = 25*10^-7;	//torque in Nm per degree
+theta = 100;            //deflaction in °
+p         = 1.7*10^-8;	//specific resistance of coil in Ω-m
+d       = 30;
+d1       = 25;
+ 
+
+//calculations
+i    = V/(R);                   //current in A
+Td   = N*B*i*l*r;               //deflecting Torque in Nm
+K    = Td/(theta);              //control constant of spring in N-m
+l     = (d+d1)*2*100*10^-3;      //length of copper coil in m
+R1     = (R*20)/(100);
+a     = (p*l)/(R1);         //area of x-section of copper wire inm^2
+D     = sqrt((4*a)/(%pi));          //diameter of wire in mm
+
+//result
+
+mprintf("diameter fo wire = %3.3f mm",(D*10^3));
+
+