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Charges q1, q2, q3, and q4 are placed in sequential order at the corners of a...

Charges q1, q2, q3, and q4 are placed in sequential order at the corners of a square of side 200 mm. Determine the direction of the force on q4 given q1 = q3 = 5 μC, q2= -10 * 21/2 μC and q4= -5 μC.

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