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Hyperreality

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How long will it takefor the potential of the sphere to increase by 1000V?

While it is easy to work out the net charge of copper = the no. of -e decayed, and the energy gained by copper, I don't really know what they meant by potentials of the sphere in this case. Since potential has unit of Joules / Coulomb, does it mean that in this case,

Potentials = Total Energy Gain / Total charge of the sphere??