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Since they have the same capacitance, sphere 1 will have 9 units of
charge and sphere 2 will have 1 unit. They'll share that equally
once they touch. After you move them far apart again they will each
have a potential of 5 V.
The capacitance of two spheres in contact is a much more complex
question. They would have a larger capacitance than the sum of the
two spheres individually. The voltage would therefore be lower than
5 V.