Three point charges are at the vertices of an equilateral triangle.If the electric field at the midpoint of any side of this triangle points perpendicular to that side away from the inside of the triangle,you can conclude that these three charges have the same amount of charge and are all negative.

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The Answer of Three point charges are at the vertices of an equilateral triangle.If the electric field at the midpoint of any side of this triangle points perpendicular to that side away from the inside of the triangle,you can conclude that these three charges have the same amount of charge and are all negative.

Three Point Charges Are at the Vertices of an Equilateral