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A small dust particle of mass 3.1 x 10-5 kg can be suspended without falling a...

A small dust particle of mass 3.1 x 10-5 kg can be suspended without falling a distance 2.6 x 10-2 m above a charged plate (circular disk) of charge 25 nC and radius 3.1 x 10-2 m. What is the charge, q, on the dust particle?

Give your answer in nC to three significant digits.

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