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+//Exa 1.23.2

+clc;

+clear;

+close;

+// Given data

+l = 1;// in m

+d = 1;// in cm

+d = d * 10^-2;// in m

+W = 1;// in mm

+W = W * 10^-3;// in m

+A = d * W;// in m^2

+I= 1;// in Amp

+B = 1;// Tesla

+V_H = 0.074 * 10^-6;// in Volts

+Sigma = 5.8 * 10^7;// in mho/m

+R_H = (V_H * A)/(B*I*d);// in m^3/c

+disp(R_H,"The hall coefficient in m^3/c is");

+Mu = Sigma * R_H;// in m^2/volt.sec

+disp(Mu,"The mobility  of electrons in copper in m^2/volt-sec is ");