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MIT 8.02 Electricity and Magnetism, Spring 2002 19 Online
OpenStudy (anonymous):

how do they find the distance if its not given? http://ocw.mit.edu/courses/physics/8-02-electricity-and-magnetism-spring-2002/assignments/ps1a.pdf i suppose the book has the value cause there is no way to find it in problem 1.1

OpenStudy (anonymous):

the distance is needed to find the eletrostatic repulsion

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