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OCW Scholar - Physics II: Electricity and Magnetism 9 Online
OpenStudy (anonymous):

Hi, i have a question for this problem: http://www.youtube.com/watch?feature=player_embedded&v=BcuQ2c_WrMc#t=20m35s Is the prof. Levin's answer correct? I get r = ab/(2a - b) and I don't know if it is a good answer and if not then I don't know why i get a wrong answer :(

OpenStudy (anonymous):

Ok, I've just solved it.

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