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In an experiment to determine the charge of a charged sphere with a mass of 2.60x10^-16...

In an experiment to determine the charge of a charged sphere with a mass of 2.60x10^-16 kg, the sphere was injected between two horizontal charged plates, separated by 3.50cm. By increasing voltage between the plates to 1.50x10^2V, the sphere eventually suspended between the charged plates.
If the voltage required to suspend the sphere was 1.50x10^2, then the charge on the sphere must be??

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