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+clear;
+clc;
+printf("\nEx-6.16\n");
+//page no.-191
+//given
+rho=1.54*10^-8;.......//resistivity in ohm m
+E=100;...............//electric field in V/m
+no=5.8*10^28;.........//no of free electrons per unit vol
+m=9.11*10^-31;....//mass
+e=1.6*10^-19;......//charge in C
+
+tau=m/(no*e^2*rho)........//mean collision time
+
+printf("\nmean collision time is 3.98*10^-14 s\n");
+v=((e*E)/m)*tau........//drift velocity
+
+printf("\ndrift velocity is 0.7 m/s\n");
+mu=v/E.........//mobility
+
+printf("\nmobility is 7*10^-3 m^2/Vs");