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Homework Statement
Calculate the electric field (magnitude & direction) at the center of a square 52.5 cm on a side if one corner is occupied by a = -38.6 µC charge and the other three are occupied by -27.8 µC charges.
Homework Equations
Enet= E1center + E2center + E3center + E4center
E2,3,4= k |Q| / (length*sqrt(2)/2)2
E1=k |Q| / (length*sqrt(2)/2)2
The Attempt at a Solution
E1=k |Q| / (length*sqrt(2)/2)2
E1=(8.99E9 Nm2/C2)(38.6E-6 C) / (0.525*sqrt(2)/2)2=2.51E6 N/C
E2,3,4= k |Q| / (length*sqrt(2)/2)2
E2,3,4=(8.99E9 Nm2/C2)(27.9E-6 C) / (0.525*sqrt(2)/2)2=1.82E6 N/C
Enet= 7.97E6 N/C
But according to Mastering Physics, the answer is 6.98E5 N/C. What did I do wrong?
And I'm thinking that direction of electric field is towards the -38.6 µC charge. Is that correct?