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Introductory Physics Homework Help
Work done by a battery to move charge
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[QUOTE="alanf, post: 4867956, member: 318091"] [h2]Homework Statement [/h2] I'm working my way through MIT 8.02x, the intro E&M course, on EdX. In Homework 3/Problem 3, we insert a dielectric between plates in a capacitor that is connected to a battery supplying potential V. So the charge on the capacitor increases by Q. How much work is done by the battery to add that charge to the capacitor plates? [h2]Homework Equations[/h2] The answer given is QV. [h2]The Attempt at a Solution[/h2] I get the answer, but I'm having a conceptual problem. I understand how when charge Q moves across a potential difference V the work done is QV. But, in the situation above, how is the charge moving "across" a potential difference? The charges here remain inside conductors, and there can't be a potential difference inside conductors - except that of course there must be, because otherwise the charge wouldn't move from the battery to the capacitor. Can someone help me muddle through this? I think my mind is still back in mechanics, where everything was force and motion. E&M is all about fields and potential energy, and I'm finding it difficult to shift my perspective. [/QUOTE]
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Work done by a battery to move charge
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