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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