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+clear;
+clc;
+printf("\nEx-6.1\n");
+//page no.-178
+//given
+sigma=6.2*10^-7;......//conductivity of silver in ohm-m
+
+n=5.8*10^28;..........//no. of free electrons per unit volume in m^3
+
+m=9.1*10^-31;.........//mass of electron in kg
+
+e=1.6*10^-19;.........//elementary charge in coulamb
+
+tau=(sigma*m)/(e^2*n).....//relaxation time
+
+printf("\nthe relaxation time is 3.8*10^-14 s\n");
+
+l=2;......//length of silver wire in m
+v=40;.....//potential diff. in V
+
+E=v/l.....//electric field in wire in V/m
+
+vd=-(e*E*tau)/m......//drift speed of electron 
+
+printf("\ndrift speed of electron is -0.13 m/s");