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+//Example 4_24
+clc;
+clear;
+close;
+format('e',9);
+//given data : 
+d=1.03;//mm
+R=6.51;//ohm per 1000 ft.
+n0=8.4*10^27;//electrons/m^3
+I=2;//A
+A=%pi/4*d^2*10^-6;//m^2
+J=I/A;//A/m^2
+e=1.6*10^-19;//C/electron
+v0=J/n0/e;//m/s
+disp(v0,"(a) Drift Velocity(m/s)");
+R=R/1000/0.304;//ohm/m
+E0=I*R;//V/m
+mu=v0/E0;//m^2/V-s
+disp(mu,"(b) Mobility(m^2/V-s)");
+sigma=n0*e*mu;//(ohm-m)^-1
+disp(sigma,"(c) Conductivity((ohm-m)^-1)")
+//Answer wrong in the book. calculation mistake.