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Introductory Physics Homework Help
Maximum potential given a charge
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[QUOTE="c1223, post: 4491695, member: 486937"] [h2]Homework Statement [/h2] So the question states that we have a hollow metal sphere of radius 2cm that is charged up. We take the breakdown field of air to be 1MV/m. We are asked to: a) Calculate the maximum amount of charge which can be placed on the sphere. b) Calculate the maximum potential on the surface of the sphere.[h2]Homework Equations[/h2] [itex]E = \frac{Q}{4\Piε_{0}r^{2}}[/itex][h2]The Attempt at a Solution[/h2] a) [itex]1\cdot10^{6} = \frac{Q}{4\Piε_{0}0.02^{2}}[/itex] [INDENT]So we get Q as being [itex]4.4\cdot10^{-8}C[/itex][/INDENT] However, I'm stuck with what to do next to get the potential. I'm not entirely sure I understand the question? Is it the potential between that space on the surface and the center of the sphere? I know the answer (or at least it is given as 20kV) but I'm not sure how to arrive at that answer. Cheers [/QUOTE]
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Maximum potential given a charge
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