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Quiz_A - e nowhere-2Q For the net force to be zero the two...

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Physics 241 – Sample Quiz A – Jan. 8, 2008 Two point charges are separated by distance d as shown. Where can you put a third charge of 1 C so that there is no net electric force acting on it? (Take Q > 0.) a) to the right of charge -2Q b) to the left of charge Q c) between the two charges d) some other place
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Unformatted text preview: e) nowhere-2Q For the net force to be zero, the two contributions (from interacting with Q and with -2Q) must exactly cancel. Since the -2Q charge is of bigger magnitude, the only place this can happen is to the left of Q where Q is closer to the third (test) charge than -2Q....
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