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Question 1

Solution

A Van de Graaff 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.


Part A: How much charge is needed on the sphere for its potential to be 550,000 V?
Express your answer to two significant figures and include the appropriate units.

 

Part B: What is the electric field strength just outside the surface of the sphere when it is charged to 550,000 V?
Express your answer to two significant figures and include the appropriate units.

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