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+// example:-2.2.page no.-26.
+// progarm to find out skin depth of aluminium,copper,gold and silver at frequency 10GHZ.
+f=10*10^9;
+muo=4*%pi*10^-7;  // permeability in free space.
+omega=2*%pi*f;
+sigma_aluminium=3.816*10^7;
+sigma_copper=5.813*10^7;
+sigma_gold=4.098*10^7;
+sigma_silver=6.173*10^7;
+delta1=sqrt(2/(omega*muo*sigma_aluminium));
+delta2=sqrt(2/(omega*muo*sigma_copper));
+delta3=sqrt(2/(omega*muo*sigma_gold));
+delta4=sqrt(2/(omega*muo*sigma_silver));
+//result
+disp(delta1,'skin depth of aluminium in meter=')  // skin depth of aluminium.
+disp(delta2,'skin depth of copper in meter=')  //skin depth of copper.
+disp(delta3,'skin depth of gold in meter=')  //skin depth of gold.
+disp(delta4,'skin depth of silver in meter=')  //skin depth of silver.
+\ No newline at end of file