Tutorial In Introductory Physics: charge

link to problem: http://ift.tt/1aoWyHT

I don’t under part two of question two on the assignment with the Case C and D. my gut instinct tells me that they are equal, but I do not have justifacation and when I look back to part one of 2 I think that Case D would have a greater force on the +q charge.

I know that Case A< Case B, and case C looks like 2(case A) and case D looks like (case A + Case B) so 2(case A) should be less than (case A +case B) meaning that Case D should be larger than C?


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