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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Coulomb's constant ： ウィキペディア英語版 Coulomb's constant Coulomb's constant, the electric force constant, or the electrostatic constant (denoted ) is a proportionality constant in equations relating electric variables and is exactly equal to  =  N·m2/C2 (i.e. m/F). It was named after the French physicist Charles-Augustin de Coulomb (1736–1806) who first used it in Coulomb's law. == Value of the constant == Coulomb's constant can be empirically derived as the constant of proportionality in Coulomb's law, :$\backslash mathbf\; =\; k\_\backslash text\backslash frac\backslash mathbf\; dA\; =\; |\backslash mathbf|\backslash mathbf$}} Noting that for some test charge ''Q'', :$\backslash mathbf\; =\; \backslash frac\backslash frac\backslash mathbf\backslash frac\backslash mathbf\; =\; \backslash frac$ This exact value of Coulomb's constant comes from three of the fundamental, invariant quantities that define free space in the SI system: the speed of light , magnetic permeability , and electric permittivity , related by Maxwell as: :$\backslash frac=c\_0^2.$ Because of the way the SI base unit system made the natural units for electromagnetism, the speed of light in vacuum is , the magnetic permeability of free space is , and the electric permittivity of free space is ,〔(CODATA Value: electric constant ). Physics.nist.gov. Retrieved on 2010-09-28.〕 so that〔(Coulomb's constant ), Hyperphysics〕 :$\backslash begin$ k_\text = \frac=\frac&=c_0^2\times 10^\ \mathrm^\\ &= 8.987\ 551\ 787\ 368\ 176\ 4\times 10^9\ \mathrm^. \end 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coulomb's constant」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.