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diff --git a/2129/CH1/EX1.23.2/ex1_23_2.sce b/2129/CH1/EX1.23.2/ex1_23_2.sce
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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 ");