Talk:Electric potential energy: Difference between revisions

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†== Negative Stored Energy in QM? ==

I find the last paragraph of the section on Stored Energy to be a bit misleading. The fact is that two oppositely charged particles held in close proximity will have less energy than two oppositely charge particles held infinitely far apart. However, both energies are formally infinite for point particles. This has nothing to do with quantum mechanics. Defining a single charged point particle to have zero energy is the quantum mechanics, and is a good introduction to the idea of renormalization. If such a paragraph were included, it would be nice to point out such subtleties, rather than cloud matters by saying the previous equation isn't true. 70.253.79.237 (talk) 18:19, 8 February 2009 (UTC)[reply]

In the context of an article about electrostatic potential energies, the final paragraph seem likely to confuse a lot of non-experts, so I have removed it as part of a general clean-up of this article (RGForbes (talk) 01:38, 15 April 2009 (UTC))(Richard)[reply]

mass

Seems like this article deals with the basics, a point charge, but doesn't advance to include charges with mass. What do you think? Thanks, Daniel.Cardenas (talk) 18:04, 16 May 2009 (UTC)[reply]

I am somewhat confused by the sign of energy in an electrical field. Say we have two oppositely charged ions. My naive thinking is: the energy of the system is U = q1*q2/r12 < 0; but it can also be U = \integral |E|^2 dr^3 >0 (according to the last section of this article)

Why the sign of U is different? or in another word, what I am missing here? —Preceding unsigned comment added by 128.219.49.9 (talk) 15:52, 7 July 2010 (UTC)[reply]

Energy in electronic elements

I think that the equation for "The total electric potential energy stored in a capacitor" is wrong... I don't see how V squared is equal to Q.

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 Why the sign of U is different? or in another word, what I am missing here?  <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/128.219.49.9|128.219.49.9]] ([[User talk:128.219.49.9|talk]]) 15:52, 7 July 2010 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->
+== Energy in electronic elements ==
+I think that the equation for "The total electric potential energy stored in a capacitor" is wrong... I don't see how V squared is equal to Q.