{"action":"reopened","issue":{"url":"https://api.github.com/repos/njitclass/Electric-Metering/issues/1","labels_url":"https://api.github.com/repos/njitclass/Electric-Metering/issues/1/labels{/name}","comments_url":"https://api.github.com/repos/njitclass/Electric-Metering/issues/1/comments","events_url":"https://api.github.com/repos/njitclass/Electric-Metering/issues/1/events","html_url":"https://github.com/njitclass/Electric-Metering/issues/1","id":106260358,"number":1,"title":"电磁学相关定则和定律","user":{"login":"njitclass","id":14267149,"avatar_url":"https://avatars.githubusercontent.com/u/14267149?v=3","gravatar_id":"","url":"https://api.github.com/users/njitclass","html_url":"https://github.com/njitclass","followers_url":"https://api.github.com/users/njitclass/followers","following_url":"https://api.github.com/users/njitclass/following{/other_user}","gists_url":"https://api.github.com/users/njitclass/gists{/gist_id}","starred_url":"https://api.github.com/users/njitclass/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/njitclass/subscriptions","organizations_url":"https://api.github.com/users/njitclass/orgs","repos_url":"https://api.github.com/users/njitclass/repos","events_url":"https://api.github.com/users/njitclass/events{/privacy}","received_events_url":"https://api.github.com/users/njitclass/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-09-14T02:33:46Z","updated_at":"2015-09-15T05:52:43Z","closed_at":null,"body":"右手定则\r\n\r\n电磁学学中，右手定则判断的主要是与力无关的方向。如果是和力有关的则全依靠左手定则。即，关于力的用左手，其他的（一般用于判断感应电流方向）用右手定则。（这一点常常有人记混，可以发现“力”字向左撇，就用左手；而“电”字向右撇，就用右手）记忆口诀：左通力右生电。 还可以记忆为：因电而动用左手，因动而电用右手。  可以用右手的手掌和手指的方向来记忆导线切割磁感线时所产生的电流的方向，即：伸开右手，使拇指与其余四个手指垂直，并且都与手掌在同一平面内；让磁感线从手心进入，并使拇指指向导线运动方向，这时四指所指的方向就是感应电流的方向。这就是判定导线切割磁感线时感应电流方向的右手定则。\r\nhttp://www.bing.com/knows/search?q=%E5%8F%B3%E6%89%8B%E5%AE%9A%E5%88%99&mkt=zh-cn\r\n"}}