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+//Example 5.2: thickness  
+clc;
+clear;
+close;
+//given data :
+Z=0.329*10^-3;// IN g/C
+I=1;// in amperes
+t=90*60;// in seconds
+M=Z*I*t;// in grams 
+A=200;//area in centimete square
+S=8.9;//density in g/cc
+T=(M)/(2*A*S);//thickness in cm
+disp(T,"thickness of copper in cm is")