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The Magnitude of an Electric Field

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Three +3.0 μC point charges are at the three corners of a square 0.50 m. The last corner is occupied by a -3.0 C charge. Find the magnitude of the electric field at the corner of the square. (k = 1/4 πε0 = 8.99 x 109 N m2/C2.

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The problem shows three equal charges that are placed at the three corners of a square and equal negative at the fourth one. The magnitude and direction of the resulting field at the center of the square is calculated.

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Electric filed strength at a point is the force per unit test charge.
The field strength due to a point charge Q at distance r from the charge is given by the equation (using coulombs law)

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