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Electric Charge and Direction of Force

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Four point charges with magnitude 5.0 uC are placed at the corners of a square that is 30 cm on a side. Two charges, diagonally opposites each other, are positive, and the other two are negative. What are the magnitude and the direction of the force on one of the charges?

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To find the force on particle "1" we use the property of superposition. Namely, the total force exerted on particle "1" is the sum of all the individual forces exerted on particle "1" by the ...

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