The following topic is now open for questions: Capacitors.
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The blog is a part of the WebTA project for the McGill University Physics 102 class on Electricity and Magnetism. A link to the static site containing examples, explanations, etc. can be found in the sidebar.
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If you have come across this site from somewhere else, please do feel free to use it as a resource. I would ask that you not post new questions as I will have to restrict the commenting function if I sense that questions from students in the course are being drowned out by others. For complete "rules" of posting see: A few groundrules.... This worked well last year, so let's keep with it.
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3 comments:
Hi,
I just posted a comment under the title of #41 but as I refreshed the page, I could not see my own comment. Did you get it? Anyways, here are my questions about capacitor: 1 #51 b)Why doubling? 2 Say, we have 2+Q on the left plate and 2 -Q on the rite, can I just add 1 +Q to the left and add nothing to the rite? Or it is a must for me to add the same amount of charges to both sides? 3 If I added 1 +Q to left and 1 -Q to rite, the total charge should be +2Q, rite? 4 #77b) what i did was PE/2=1/2*m*v^2, what is wrong with my solution( i know it must be wrong -_-||)?
Thank you so much!
I did receive your comment. They won't appear right away as I have to clear them first (to make sure spam doesn't appear).
I'll try to get to your questions shortly.
If two plates of a capacitor with constant charge have their separation doubled, the energy stored also doubles. I'm confused as to why this happens, since I thought E-stored was related to C, and C decreased as distance of separation increased. I'm looking at the equation Energy Stored = 0.5CV^2.
KSL
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