File:Electroscope showing induction.png

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摘要

描述Electroscope showing induction.png	English: Drawing of a gold leaf electroscope, an antique scientific instrument invented in 1787 by British clergyman Abraham Bennett that detects electric charge. It consists of a pair of delicate gold leaves hanging parallel to each other from a brass post, protected by a glass jar. The brass post projects from the mouth of the jar and ends in an electrode to which charged objects can be applied. When a charge is applied to the post, the leaves, carrying the same charge, repel each other, and diverge into a "V" shape. This example shows electrostatic induction of charge in the instrument by holding a charged dielectric rod near it. The positive charge on the rod causes the mobile charges in the brass post to separate, with negative charges being attracted into the top electrode, while positive charges are repelled into the leaves, causing them to separate. Alterations to image: Added colored plusses and minuses showing areas of charge.
日期	1881年
來源	Downloaded from Sylvanus P. Thompson (1881) Elementary Lessons in Electricity and Magnetism, MacMillan, New York, p.16, fig. 12
作者	Original version: Sylvanus P. Thompson Derived version: Chetvorno
許可 (重用呢個檔案)	Public domain - published in US prior to 1923

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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	日期／時間	縮圖	尺寸	用戶	註解
現時	2008年4月30號 (三) 19:32		797 × 684（37 KB）	Chetvorno	{{Information \|Description=Woodcut of gold leaf electroscope, showing induction of charge. Alterations to image: Added colored plusses and minuses showing areas of charge. \|Source=Copied from Sylvanus P. Thompson (1881) ''Elementary Lessons in Electricit