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+// Exa 2.30
+clc;
+clear;
+close;
+// Given data
+e=1.6*10^-19;// in C
+miu_e= 0.0032;// in m^2/v-s
+sigma= 5.8*10^7;// in s/m
+E= 20*10^-3;// in V/m
+d=0.002;// in m
+Area= %pi*d^2/4;// in m^2
+
+// Part (a)
+n= sigma/(e*miu_e);// per m^3
+disp(n,"The charge density per meter cube is : ")
+
+// Part (b)
+J= sigma*E;// in A/m^2
+disp(J,"Current density in A/m^2 is : ")
+
+// Part (c)
+I= J*Area;// in A
+disp(I,"Current flowing in the wire in ampere is : ")
+
+// Part (d)
+v=miu_e*E;// in m/sec
+disp(v,"Electron drift velocity in m/sec is : ")