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+//chapter 2
+//For Half wave Dipole
+//Hphi=Im/(2*pi*r)*cos(pi/2*cos(theta)/sin(theta))
+//Rrad=73 ohm
+Hphi=5*10^-6;
+r=2*10^3;
+Im=(5*10^-6)*(4*(%pi)*10^3);
+Prad=73*(Im/sqrt(2))^2;
+printf("the radiated power is %gW",Prad);