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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));
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