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第5讲:E = -grad V，更多关于等势面、导体、静电屏蔽(法拉第笼)
Lecture 5: E = -grad V, More on Equipotential Surfaces, Conductors, Electrostatic Shielding (Faraday Cage) |
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| 课程网址: |
http://videolectures.net/mit802s02_lewin_lec05/
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| 主讲教师: |
Walter H. G. Lewin
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| 开课单位: |
麻省理工学院
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| 开课时间: |
2008-10-10
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| 课程语种: |
英语
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| 中文简介: |
//“所以今天没有新的概念，没有新的想法，你可以释放一点点，我想和你讨论电势和电场之间的关系。//我想你在太空中有一个电场，那个我在口袋里拿了一个电荷Q，我从A位置开始走路，然后我四处走动，然后我返回A.////因为这些力是保守的力量，如果电场是静电场，就没有了移动电荷，但这变得更加困难，那么力量就是保守的力量，所以当我四处走动并回到A点时我所做的工作必须为零。当你看到第三个等式时你很清楚点A和点A之间的差异显然是零。我从点A开始，我在点A结束，这是从A点回到E点DL点A的积分，然后必须为零。 //我们通常用圆圈表示这样一个整数，这意味着你最终会在你开始的地方结束现在，这不是一个封闭的表面，正如我们在方程式一中那样...“//
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| 课程简介: |
//"So today no new concepts, no new ideas, you can release a little bit and I want to discuss with you the connection between electric potential and electric fields.// //Imagine you have an electric field here in space and that I take a charge Q in my pocket, I start at position A and I walk around and I return at that point A.// //Since these forces are conservative forces, if the electric field is a static electric field, there are no moving charges, but that becomes more difficult, then the forces are conservative forces and so the work that I do when I march around and coming back at point A must be zero. It's clear when you uh look at the equation number three that the potential difference between point A and point A is obviously zero. I g- start at point A and I end at point A and that is the integral in going from A back to point A of E dot DL and that then has to be zero.// //And we normally indicate such an integral with a circle which means you end up where you started. This is a line now this is not a closed surface as we had in equation one..."//
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| 关 键 词: |
电势; 电场; 静电场
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| 课程来源: |
视频讲座网
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| 最后编审: |
2019-05-25：lxf
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| 阅读次数: |
215
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