9. The xcomponent of the electric field at the center of the square is given by ()312422220123420||1cos 454(/ 2) (/ 2)1114/220.xqqqqEaaaaqqqqaε⎡⎤=+−−°⎢⎥⎣⎦−−=ππSimilarly, the ycomponent of the electric field is 340209228521cos454)1228.99 10 N m / C(2.0 10 C)11.02 10 N/C.(0.050 m) / 22yqqEaπε−=−++−°++−×⋅×==×Thus, the electric field at the center of the square is
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