here,
a = 26 cm = 0.26 m
b = 66 cm = 0.66 m
the distance of center from corner , r = sqrt(a^2 + b^2 )/2
r = sqrt(0.26^2 + 0.66^2) /2 = 0.355 m
as q1 and q3 are equal in magnitude and same direction of charge
the electric feild due to them on center cancels out
so, the net electric feild at the center , E = K * q2 /r^2
E = 9 * 10^9 * 34 * 10^-6 /0.355^2 N/C
E = 2.43 * 10^6 N/C
the magnitude of electric feild at the center of rectangle is 2.43 * 10^6 N/C
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