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+// chapter 6 , Example6.13 , pg 177
+rho=1.54*10^-8    //resistivity    (in ohm*m)
+E=100    //electric field intensity     (in V/m)
+n=5.8*10^28     //electron concentration    (in /m^3)
+e=1.6*10^-19     //charge of electron     (in C)
+Me=9.11*10^-31    //mass of electron    (in Kg)
+T=Me/(rho*n*e^2)      //relaxation time
+Vd=(e*E*T)/Me      //drift velocity
+U=Vd/E     //mobility
+printf("Relaxation time  (in s)")
+disp(T)
+printf("Drift veloity  (in m/s)")
+disp(Vd)
+printf("Mobility(in m^2/(V*s))")
+disp(U)