Point charges are arranged on the vertices of a square with sides of 2.50 cm. Starting at the upper left corner and going clockwise, we have charge A with a charge of 0.200 μC, B with a charge of ˆ’0.150 μC, C with a charge of 0.300 μC, and D with a mass of 2.00 g, but with an unknown charge. Charges A, B, and C are fixed in place, and D is free to move. Particle D's instantaneous acceleration at point D is 248 m/s 2 in a direction 30.8° below the negative x -axis. What is the charge on D?

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2.50 cm 2.50 cm 30.8 248 m/s