Ptt 大爆卦 | 10 mm - 前往 https://www.toppr.com/ask/question/the-number-of-free-electrons-per-10mm-of-an-ordinary-copper-wire-is-about-2times/

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The number of free electrons per

... 10mm of an ordinary copper wire is about 2 × 10^21 . The average drift speed of the electrons is 0.25mm/sec . The current flowing is.

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