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Figure shows five electric charges. Four charges with the magnitude of the charge 2.0 nC form a square with the size a = 4.0cm. Positive charge with the magnitude of q = 8.0nC is placed in the center of the square. What is the magnitude of the force on the 8.0nC charge in the middle of the figure due to the four other charges?

1198_Figure shows five electric charges.jpg

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