정전기학

정전기학(靜電氣學, electrostatics)은 대전된 물체에 의한 전기장이 변하지 않을 때의 물리학을 다루는 학문이다. 일반적으로 정전기학엔 부도체 표면간의 접촉에 따른 전하의 발생, 즉 정전기 현상도 포함된다. 이러한 현상은 한 물체의 전자가 다른 물체로 옮겨지면서 일종의 방전이 일어나기 때문에 일어난다. 인체에 남겨진 정전기는 다른 물체와 접촉했을 때 방전을 일으키면서 쇼크를 주기도 하는데, 보통 수천~수만 볼트의 고전압이지만 전류가 약해 인체에 심각한 영향을 주는 경우는 별로 없다.

정전기학의 기술

전위 V와 전기장 는 다음과 같은 관계를 갖는다.

기본 개념

쿨롱의 법칙

쿨롱의 법칙은 정전기학을 기술하는 가장 기본적인 방정식으로 두 점전하 사이에 작용하는 힘을 뜻한다.

  • ,  : 두 점전하의 전위
  •  : 점전하 사이의 거리
  • 는 쿨롱 상수로 보통 로 표기하기도 한다.

전기장

전기장(단위는 V/m)은 단위 전하(단위는 C)에 작용하는 힘의 크기(단위는 N)로 정의된다. 이 정의와 쿨롱의 법칙을 이용하면 전하 가 만들어내는 전기장 의 크기를 다음과 같이 유도할 수 있다.

전자기 유도

정전기

정전기는 표면 스핀으로 도체 내부 전류, 외부에서 비스듬히 입사한 광, 그리고 다른 물체로 문지름 등에 의해 발생한다.

같이 보기

Read other articles:

Hector BerliozNama dalam bahasa asli(fr) Hector Berlioz BiografiKelahiran(fr) Louis-Hector Berlioz 11 Desember 1803 La Côte-Saint-André Kematian8 Maret 1869 (65 tahun)Paris Tempat pemakamanPemakaman Montmartre, 20 Data pribadiAgamaAteisme PendidikanConservatoire de Paris KegiatanSpesialisasiMusik seni, musik, music composing (en), conducting (en) dan Komposisi musik PekerjaanWartawan, dirigen, penulis, otobiografer, music critic (en), librettist (en), Virtuoso, Pustakawan dan komponis Perio...

 

本條目存在以下問題,請協助改善本條目或在討論頁針對議題發表看法。 此條目需要补充更多来源。 (2018年3月17日)请协助補充多方面可靠来源以改善这篇条目,无法查证的内容可能會因為异议提出而被移除。致使用者:请搜索一下条目的标题(来源搜索:羅生門 (電影) — 网页、新闻、书籍、学术、图像),以检查网络上是否存在该主题的更多可靠来源(判定指引)。 �...

 

Dutch passion play The PassionThe logo, as seen during the staging in RotterdamGenreMusicCreated byAndy King-Dabbs and Jacco Doornbos [nl]Directed byDavid GrifhorstComposersCor Bakker (2011-2012)Eric van Tijn (2013-present)Country of originNetherlandsProductionProducerCynthia van IngenRunning time90 minutesOriginal releaseNetworkEOKRO-NCRVRelease21 April 2011 (2011-04-21) The Passion is a Dutch passion play, held every Maundy Thursday since 2011 in a different city...

Joël Le Theule Fonctions Ministre de la Défense 2 octobre – 14 décembre 1980(2 mois et 12 jours) Président Valéry Giscard d'Estaing Premier ministre Raymond Barre Gouvernement Barre III Prédécesseur Yvon Bourges Successeur Robert Galley Ministre des Transports 31 mars 1978 – 2 octobre 1980(2 ans, 6 mois et 1 jour) Président Valéry Giscard d'Estaing Premier ministre Raymond Barre Gouvernement Barre III Prédécesseur Yves Guéna Successeur Daniel Hoeffel ...

 

Polish artist Agata Materowicz5 International Festival Art & Documentation, 2013, Lodz, PolandNationalityPolishEducationFaculty of Visual Arts at Academy of Fine Arts in Lodz, Poland University Of Computer Sciences and Skills, Lodz, PolandKnown forArtistWebsiteAgata Materowicz Facebook Agata Materowicz (born 1963) is a contemporary Polish artist. She is a multi-disciplinary artist specialises in oil painting, including copies of masterworks and portraits painting, animation, puppetry...

 

Autonomous soviet socialist republic of a union republic of the Soviet Union Komi AutonomousSoviet Socialist RepublicКоми Автономная СоветскаяСоциалистическая Республика (Russian)Коми Автономнӧй СӧветскӧйСоциалистическӧй Республика (Komi-Zyrian)ASSR of the Russian SFSR1936–1991 Flag Emblem CapitalSyktyvkar • TypeAutonomous Soviet Socialist Republic History • Es...

Pour les articles homonymes, voir Lambeth. Borough londonien de Lambeth Carte de localisation dans le Grand Londres. Administration Pays Royaume-Uni Nation constitutive Angleterre Comté Grand Londres Comté cérémonial Grand Londres Statut Borough Gouvernement Leader & Cabinet Députés Kate Hoey, Tessa Jowell, Chuka Umunna Assemblée · Membre Lambeth and SouthwarkMarina Ahmad Maire Annie Gallop Démographie Population 326 034 hab. (2019) Densité 12 156&...

 

The Hidden HeroPoster teatrikal untuk The Hidden Hero (1980)Nama lainHangul깃발없는 기수 Hanja깃발없는 旗手 Alih Aksara yang DisempurnakanGitbal eobneun gisuMcCune–ReischauerKitpal ŏmnŭn kisu SutradaraIm Kwon-taek[1]ProduserPark Chong-chanPemeranHah Myung-joongPenata musikGang Seok-huiSinematograferLee Suck-kiPenyuntingKim Hee-suDistributorHwa Chun Trading Co.Tanggal rilis 04 September 1980 (1980-09-04) Durasi96 menitNegaraKorea SelatanBahasaKorea The ...

 

American politician Todd HustonSpeaker of the Indiana House of RepresentativesIncumbentAssumed office March 9, 2020Preceded byBrian BosmaMember of the Indiana House of Representativesfrom the 37th districtIncumbentAssumed office November 20, 2012Preceded byScott Reske Personal detailsBorn (1972-04-06) April 6, 1972 (age 52)Fishers, Indiana, U.S.Political partyRepublicanEducationIndiana University Bloomington (BA) Todd Huston is an American politician serving as the cu...

Middle High German poet This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.Find sources: Gottfried von Strassburg – news · newspapers · books · scholar · JSTOR (May 2019) (Learn how and when to remove this message) In this medieval name, the personal name is Gottfried and von Strassburg is an appellation or descriptor. T...

 

GNOME Office Тип Офисный пакет Разработчик Проект GNOME Операционная система Кроссплатформенный Последняя версия 2.24 Лицензия GNU GPL Сайт live.gnome.org/GnomeOffi… GNOME Office — набор независимых программ, выполняющий роль офисного пакета проекта GNOME[1]. Содержание 1 Стандартные офисные п�...

 

Men's lacrosseat the Games of the IX OlympiadDateAugust 5–7Competitors52 from 3 nations← 19081932 (demonstration) → Lacrosse was a demonstration sport at the 1928 Summer Olympics in Amsterdam. Teams from Canada, Great Britain, and the United States played round-robin matches on August 5, 6 and 7. Each team ended the tournament with a record of 1 win and 1 loss. The Johns Hopkins Blue Jays men's lacrosse team represented the United States.[1] Canada an...

マリオン・スコットMarion McCarrell Scott 生誕 (1843-08-21) 1843年8月21日 アメリカ合衆国 ケンタッキー州バーレン郡死没 (1922-05-03) 1922年5月3日(78歳没) アメリカ合衆国 ハワイ準州ホノルル郡ホノルル墓地 オアフ墓地(ホノルル)国籍 アメリカ合衆国出身校 ウラニア・カレッジバージニア大学職業 教育者、教育行政官受賞 勲四等旭日章、勲五等双光旭日章テンプレートを表�...

 

Gil Scott-HeronGil Scott-Heron nel 1986 Nazionalità Stati Uniti GenereSoulJazz-funkProto-rapFolk Periodo di attività musicale1969 – 2011 Strumentovoce, piano elettrico, chitarra Sito ufficiale Modifica dati su Wikidata · Manuale Gil Scott-Heron (Chicago, 1º aprile 1949 – New York, 27 maggio 2011) è stato un poeta, musicista e attivista statunitense, conosciuto principalmente per i suoi lavori della fine degli anni sessanta e inizi degli anni settanta come...

 

Ряска малая Общий вид колонии растений Научная классификация Домен:ЭукариотыЦарство:РастенияКлада:Цветковые растенияКлада:МонокотыПорядок:ЧастухоцветныеСемейство:АроидныеПодсемейство:РясковыеРод:РяскаВид:Ряска малая Международное научное название Lemna minor L., 1753 Си...

Pour l'unité monétaire, voir Pence. Mike Pence Portrait officiel de Mike Pence en 2017. Fonctions 48e vice-président des États-Unis 20 janvier 2017 – 20 janvier 2021(4 ans) Élection 8 novembre 2016 Président Donald Trump Gouvernement Administration Trump Prédécesseur Joe Biden Successeur Kamala Harris 50e gouverneur de l'Indiana 14 janvier 2013 – 9 janvier 2017(3 ans, 11 mois et 26 jours) Élection 6 novembre 2012 Lieutenant-gouverneur Sue Ellsperman...

 

NGC 1634 La galaxie lenticulaire NGC 1634 Données d’observation(Époque J2000.0) Constellation Taureau Ascension droite (α) 04h 40m 09,8s[1] Déclinaison (δ) 07° 20′ 20″ [1] Magnitude apparente (V) 14,1[2] 15,1 dans la Bande B[2] Brillance de surface 11,80 mag/am2[2] Dimensions apparentes (V) 0,4′ × 0,3′[2] Décalage vers le rouge 0,014710 ± 0,000080[1] Angle de position 109°[2] Localisation dans la constellation : Taureau Astrométrie V...

 

Rugby playerRicky JanuarieBirth nameEnrico Ricardo JanuarieDate of birth (1982-01-02) 2 January 1982 (age 42)Place of birthHopefield, South AfricaHeight1.68 m (5 ft 6 in)Weight95 kg (209 lb)SchoolWeston Senior SecondaryRugby union careerPosition(s) Scrum-halfProvincial / State sidesYears Team Apps (Points)1999-2001 Louwville 17 (45)2002 Boland Cavaliers 2 (0)2003–2007 Golden Lions 8 (20)2008–2011 Western Province 11 (15)2009–2010 Ospreys (loan) 2 (5)2011–2015...

Scheme for controlling errors in data over noisy communication channels Interleaver redirects here. For the fiber-optic device, see optical interleaver. In computing, telecommunication, information theory, and coding theory, forward error correction (FEC) or channel coding[1][2][3] is a technique used for controlling errors in data transmission over unreliable or noisy communication channels. The central idea is that the sender encodes the message in a redundant way, m...

 

Parish in BarbadosSaint AndrewParishSaint Andrew´s Parish ChurchMap of Barbados showing Saint AndrewCoordinates: 13°14′N 59°34′W / 13.233°N 59.567°W / 13.233; -59.567CountryBarbadosLargest villageBelleplaineGovernment • TypeParliamentary democracy • Parliamentary seats1Area • Total36 km2 (14 sq mi)Population (2010 census) • Total5,139 • Density140/km2 (370/sq mi)ISO 3166 ...