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+//chapter 7
+printf("\n");
+ht=150;
+hr=2;
+Is=9;
+d=40*10^3;
+f=1.2*10^6;
+c=3*10^8;
+lamda=c/f;
+printf("the wavelength is %dm",lamda);
+E=120*(%pi)*ht*hr*Is/(lamda*d);
+printf("\nthe electric field is %gV/m",E);