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//=====================================================================================
//Chapter 13 example 10
clc;clear all;
//variable declaration
d = 0.3; //diameter in m
a = 4*10^-4; //cross sectional area of iron ring in m**2
N = 80; //number of turns on magnetising coil
Ns = 30; //number of turns on secondary coil
F = 0.1*10^-3; //flux meter constant in Wb-turn
D = 46; //deflection factor
I = 2; //current in A
//calculations
//phi = (N*I*u0*ur*a)/l
// phi = x*l
//lat x = (N*I*u0*a)/l
l = d*%pi;
u0 = 4*(%pi)*10^-7;
x =(N*I*u0*a)/(l);
// total change in Wb-turns y = 2*phi*Ns = 2*x*ur*Ns
y = 2*x*Ns;
df = F*D; //change in flux measuredby the flux meter in wb-turns
ur =df/y; //relative permeability
//result
mprintf("relative permeabitlity = %3.0d",ur);
mprintf("\n Note:textbook answer represents the approximate value")
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