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diff --git a/3020/CH16/EX16.1/ex16_1.sce b/3020/CH16/EX16.1/ex16_1.sce
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+++ b/3020/CH16/EX16.1/ex16_1.sce
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+clc;
+clear all;
+e = 1.6e-19; // Charge of an electron
+m = 9.11e-31; // Mass of an electron in Kg
+r = 1.73e-8 ; // Resistivity of copper in ohm meter
+at = 63.5; // Atomic weight of copper in gm
+d = 8.92e3; // Density of copper in Kg per cubic meter
+N = 6.023e26; // Avagadros number
+n = (N*d)/at; //Carrier Concentration
+rhoc = 1/r // Conductivity of copper
+t = (rhoc*m)/(n*e^2); //Average collision time
+u = rhoc/(n*e);// Mobility of electrons in copper
+disp('m^2/(V.s)',u,'Mobility of electrons in copper is')
+disp('s',t,'Average time collision of electrons in copper')
+//Wrong answer printed in textbook of aberage time collision