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// Scilab code Ex4.9: Pg 121-122 (2008)
clc; clear;
// Part (a)
I = 0.2; // Electric current, A
l = 5e-02; // Effective length, m
A = 7e-04; // Cross-sectional area, metre-square
d = 0.5e-03; // Diametre, m
mew_r = 1; //Relative permeability for wood
mew_o = 4*(%pi)*1e-07; // Pemeability for free space
N = l/d; // Number of turns
// Since mmf is the product of the current and the number of turns, therefore, we have
F = N*I; // Magnetomotive force, At
// Part (b)
// Since magnetic field strength is defined as the mmf per metre length of the magnetic circuit, therefore, we have
H = F/l; // Magnetic field strength, At/m
B = ( mew_r * mew_o * H ); // Flux density, T
// Part (c)
phi = B * A; // Flux, Wb
printf("\nThe mmf produced = %2d At", F);
printf("\nThe flux density produced = %3d micro-tesla", B/1e-06);
printf("\nThe flux produced = %5.3f micro-weber", phi/1e-06);
// Result
// The mmf produced = 20 At
// The flux density produced = 502 micro-tesla
// The flux produced = 0.352 micro-weber
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