Four point charges have the same magnitude of 3.0 × 10-12 C and are fixed to the corners of a square that is 4.3 cm on a side. Three of the charges are positive and one is negative. Determine the magnitude of the net electric field that exists at the center of the square.
field due to two diagonally opposite positive charge is equal and opposite hence they cancel each other, so the net field is only given by sun of two diagonally opposite charge fields
net field = field due to positive charge + field due to negative charge
E = k (q1 + q2) / r^2
E = 9* 10^9* 10^-12* ( 3 + 3) / ( 0.043^2 / 2)
E = 58.41 N/C
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Comment in case any doubt, will reply for sure.. Goodluck
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