A Van de Graaft generator is a device for generating a large electric potential by building up charge on a hollow metal sphere, A typical classroom-demonstration model has a diameter of $30 cm$ How much charge is needed on the sphere for its potential to be $450, 000 V$ ? Express your answer to two significant figures and include the appropriate units. Part B What is the electric field strength just eutside the surface of the sphere when it is charged to $450.000 V$ ? Express your answer to two signillcant figures and include the appropriate units

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A Van de Graaft generator is a device for generating a large electric potential by building up charge on a hollow metal sphere, A typical classroom-demonstration model has a diameter of

30 cm

How much charge is needed on the sphere for its potential to be

450, 000 V

? Express your answer to two significant figures and include the appropriate units. Part B What is the electric field strength just eutside the surface of the sphere when it is charged to

450.000 V

? Express your answer to two signillcant figures and include the appropriate units

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