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May 20, 2019 at 16:09 comment added Farcher @Physics That is what you get when changing the variable from $x$ to $r$ as stated in the last part of my answer.
May 20, 2019 at 16:06 comment added Physics Thank you, but why is the upper limit the smaller quantity (R-a) and not the lower limit?
May 20, 2019 at 16:04 vote accept Physics
May 20, 2019 at 15:45 history answered Farcher CC BY-SA 4.0