Let the potential difference between the high potential inner shell of a Van de Graff accelerator and the point at which charges are sprayed onto the moving belt be . If the belt transfers charge to the shell at the rate of , we have to calculate the minimum power that must be provided to drive the belt.

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The potential difference between the high-potential inner shell of the Van de Graff accelerator and the point at which charges are sprayed is . The belt transfers charge to the shell at the rate of .

The amount of energy required per second in moving of charge across a potential difference of will be