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The question is answered here:
https://www.bartleby.com/questions-and-answers/consider-a-system-of-n-free-electrons-within-a-volume-v.-even-at-absolute-zero-such-a-system-exerts-/0f53cb1e-441f-4500-9d5a-5c58757d8271
Can someone clarify the part with the red arrow? How did we get there?
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