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Two conducting spheres, each with charge Q, repel each other. The spheres are attached to very...

Two conducting spheres, each with charge Q, repel each other. The spheres are attached to very light and long strings and are hung from the same point. The spheres have a mass of 0.2g and are separated by 5 cm, when measured from center to center. The string tension force is measured to be 0.002 N, what is the charge on one of the sphere? (Hint: draw a diagram of the string tension force, the gravitational force, and the electrostatic Coulomb force)

Please explain. Thank you!

Multiple choice options: 0.04 mC, 4 pC, 0.45 mC, 0.2 pC, 0.002 mC

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