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+// Exa 1.8
+clc;
+clear;
+close;
+format('v',8)
+// Given data
+rho = 0.5;// in ohm-m
+J = 100;// in A/m^2
+miu_e = 0.4;// in m^2/V-s
+e = 1.6*10^-19;// in C
+sigma = 1/rho;
+E = J/sigma;
+v = miu_e*E;// in m/s
+disp(v,"The drift velocity in m/s is");
+D = 10;// distance of travel in µm
+D = D * 10^-6;// in m
+// Time taken by electron
+t= D/v;// time taken in second 
+disp(t,"The time taken in second is");