File:Electroscope showing induction.png

页面内容不支持其他语言。
维基教科书,自由的教学读本

原始文件(797 × 684像素,文件大小:37 KB,MIME类型:image/png

摘要

描述
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
来源 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
授权
(二次使用本文件)
Public domain - published in US prior to 1923

许可协议

Public domain
Public domain
这个媒体文件在美国属于公有领域。这适用于版权过期的美国作品,通常因为其首次出版于1929年1月1日之前,或即便当天或以后出版,其并未包含版权通告或获得版权回溯。查看这个页面可以获取到更多的解释。

United States
United States
这个图片在美国以外可能尚未处于公有领域;尤其在对美国作品不适用较短期限法则的国家和地区,如加拿大、中国大陆(不含香港及澳门)、德国、墨西哥和瑞士。创作者和发表年份是关键信息,因此必须提供。参见维基百科:公有领域维基百科:版权信息以获取更多细节。

说明

添加一行文字以描述该文件所表现的内容

此文件中描述的项目

描绘内容

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2008年4月30日 (三) 19:322008年4月30日 (三) 19:32版本的缩略图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

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件:

查看本文件的更多全域用途