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+clear
+//Given
+r=0.12*10**-2 //m
+I=10
+r1=0.08*10**-2 //m
+I=10 //A
+e=1.6*10**-19 //C
+n=8.4*10**28
+
+//Calculation
+//
+A=%pi*(r**2)
+J=I/A
+A1=%pi*r1**2
+Vd=I/(e*n*A1)
+
+//Result
+printf("\n (i) Current density in the alluminium wire is %0.1f *10**6 A/m**2",J*10**-6)
+printf("\n (ii) Drift velocity of electrons in the copper wire is %0.1f *10**-4 m/S",Vd*10**4)