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Permitivitas vakum

Konstanta fisika ε0, umumnya disebut permitivitas vakum, permitivitas ruang hampa atau konstanta listrik, adalah konstanta fisika ideal yang merupakan nilai permitivitas dielektrik absolut vakum klasik. Nilainya adalah

ε0 = 8.854 187 817... × 10−12 F·m−1 (farad per metre).

Ini adalah kemampuan vakum untuk bisa dilewati garis medan listrik. Konstanta ini menghubungkan medan listrik dengan besaran mekanik seperti panjang dan gaya.[1] Contohnya, gaya antara 2 muatan listrik terpisah (pada vakum) dinyatakan oleh Hukum Coulomb:

dengan q1 dan q2 adalah muatan, dan r adalah jarak antar keduanya. ε0 juga muncul pada persamaan Maxwell yang menjelaskan karakteristik medan listrik, medan magnet, dan radiasi elektromagnetik dan menghubungkannya ke sumbernya.

Nilai

Nilai ε0 saat ini didefinisikan oleh rumus[2]

dengan c adalah nilai kecepatan cahaya dalam ruang vakum dalam satuan SI,[3] dan μ0 adalah parameter "konstanta magnetik" (atau permeabilitas vakum). Karena μ0 telah memiliki nilai definisi 4π × 10−7 Hm−1,[4] dan c memiliki nilai definisi 299792458 m⋅s−1,[5] maka ε0 memiliki nilai definisi sekitar

ε08.854187817620... × 10−12 Fm−1 (atau A2s4kg−1m−3 dalam satuan pokok SI, atau C2N−1m−2 atau CV−1m−1 dengan satuan SI lain).[6][7]

Catatan

  1. ^ "Electropedia: International Electrotechnical Vocabulary (IEC 60050)". Geneva: International Electrotechnical Commission. Diakses tanggal 2015-03-26.  Parameter |contribution= akan diabaikan (bantuan).
  2. ^ Nilai numerik eksak bisa dilihat di: "Electric constant, ε0". NIST reference on constants, units, and uncertainty: Fundamental physical constants. NIST. Diakses tanggal 2012-01-22.  This formula determining the exact value of ε0 is found in Table 1, p. 637 of PJ Mohr, BN Taylor, DB Newell (April–June 2008). "Table 1: Some exact quantities relevant to the 2006 adjustment in CODATA recommended values of the fundamental physical constants: 2006" (PDF). Rev Mod Phys. 80 (2): 633–729. arXiv:0801.0028alt=Dapat diakses gratis. Bibcode:2008RvMP...80..633M. doi:10.1103/RevModPhys.80.633. Diarsipkan dari versi asli (PDF) tanggal 2011-08-05. Diakses tanggal 2016-02-08. 
  3. ^ Quote from NIST: "The symbol c adalah simbol konvensional untuk kecepatan cahaya dalam vakum. " See NIST Special Publication 330, p. 18 Diarsipkan 2016-06-03 di Wayback Machine.
  4. ^ See the last sentence of the NIST definition of ampere.
  5. ^ See the last sentence of the NIST definition of meter.
  6. ^ Mohr, Peter J.; Taylor, Barry N.; Newell, David B. (2008). "CODATA Recommended Values of the Fundamental Physical Constants: 2006". Rev. Mod. Phys. 80 (2): 633–730. arXiv:0801.0028alt=Dapat diakses gratis. Bibcode:2008RvMP...80..633M. doi:10.1103/RevModPhys.80.633.  Direct link to value..
  7. ^ A summary of the definitions of c, μ0 and ε0 is provided in the 2006 CODATA Report: CODATA report, pp. 6–7

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