Find the force on the charge at the vertex of an equilateral triangle.

Three equal charges of 0.5 uC lie at the corners of an equilateral triangle ABC of side a. Find the force on the charge at point A if a = 20 cm .

Please see the attachment for the diagram.

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...0 degrees at point C, because like charges repel.

Now we can ignore the charge at point B and look at A and C. The magnitude will be the same as above, only the direction changes. At point A, the ...