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diff --git a/1409/CH2/EX2.21/2_21.sce b/1409/CH2/EX2.21/2_21.sce
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+clc;
+//Page no:2-31
+//Example-2.21
+//Given antenna current is 12A when only carrier is sent. It is increased to 15A when carrier is modulated by 1kHz sine wave
+It=15;
+Ic=12;
+u=sqrt(2*[(It/Ic)^2-1]);
+disp(u,'u=');
+u1=u*100;
+disp(+'%',u1,'i.e');
+u2=0.7;
+Itot=Ic*sqrt(1+(u2^2/2));
+disp(+'Amp',Itot,'It=');