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4. Four equal charges of +5.0×10-7 C are placed on the corners of one face of...

4.

Four equal charges of +5.0×10-7 C are placed on the corners of one face of a cube of edge length 7.0 cm. A charge of -5.0×10-7 C is placed at the center of the cube. What is the magnitude of the force on the charge at the center of the cube?

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