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//ex3.12 find the electric field and its direction just above the surface.
theta=60; //degree
Et1=10*cosd(theta);
En1=5*sind(theta);
Et2=Et1;
En2=4*En1;
E2=sqrt(Et2^2+En2^2);
angle=atand(En2/Et2);
disp('the electric field is = '+string(E2)+' V/m','angle above the surface is = '+string(angle)+' degree');
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