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//=====================================================================================
//Chapter 13 example 9
clc;clear all;
//variable declaration
R = 2000; //resistance in Ω
l = 1; //mean length of iron ring in m
A = 350*10^-6; //area in m**2
Ns = 200; //number of turns on secondary coil
G1 = 1*10^-6; //galvanometer constant C
G2 = 100; //galvanometer throw
N =100;
//calculations
u0 = 4*(%pi)*10^-7;
H = (N*I)/(l); //magnetising force with 10 A current
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*R)/(2*Ns); //flux in Wb
B = phi/(A); //flux density in Wb/m**2
ur = (B/(u0*H)); //relative permeability
//result
mprintf("flux density = %3.3f Wb/m**2",B);
mprintf("\nrelative permeability = %3.0f",ur);
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