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+// Mobility of free electrons in Alluminium
+// Basic Electronics
+// By Debashis De
+// First Edition, 2010
+// Dorling Kindersley Pvt. Ltd. India
+// Example 1-22 in page 50
+
+clear; clc; close;
+
+// Data given
+n_0=18*10^28; // Derived from the given formula in textbook
+rho=3.44*10^-6; // Resistivity in ohm-cm
+e=1.6*10^-19; // Charge on an electron in C
+
+// Calculation
+mu=10^2/(n_0*e*rho);
+
+printf("Mobility of free electrons is %0.0e m^2/V-s",mu);
+
+// Result
+// Mobility of free electrons in Alluminium is 10^-3 m^2/V-s
+\ No newline at end of file
diff --git a/181/CH1/EX1.22/example1_22.txt b/181/CH1/EX1.22/example1_22.txt
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+Mobility of free electrons is 1e-003 m^2/V-s 
+\ No newline at end of file