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  1. I agree that cases 1 and 3 are both 0 (although I think that the word "moment" should not have been in the question). For 2, the moment is M = F*d = q*E*d where q = 2e and you should NOT add cos90, since that's 0 and you don't have a zero torque...

    2 Answers · Science & Mathematics · 06/09/2019

  2. The unrounded answer from part a) is 3.2344x10^17 N/C. It's best to use this unrounded value in part b). The force on charge q in field E is simply F = qE. We can ignore the electron charge's minus sign as we are only...

    1 Answers · Science & Mathematics · 04/09/2019

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