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所在平台: Udemy |
课程主页: https://www.udemy.com/course/electric-flux-basics-to-advanced-level/
课程评论：没有评论
**课程名称：** 电通量 - 从基础到进阶 **课程概述：** 本课程将深入探讨电通量的概念，教授如何计算电通量，并运用水流的类比来帮助理解。课程从一个简单的水流通过管道的场景开始，解释了当管道截面积倾斜于水流方向时，有效截面积如何通过角度的余弦值来计算。 接着，课程将电场类比为液体的流动，但强调了电场是不可见的。电通量被定义为每秒通过给定面积的电场线的数量。课程指出，尽管闭合曲面内的电通量仅受内部电荷影响，但总电场（E）却可能受到曲面外部电荷的影响。 课程强调，高斯定律在所有情况下均适用，但当电场具有高度对称性时，如球体或圆柱体，应用高斯定律会更为简便。 **电通量的单位：** * 国际单位制（SI）单位为伏特·米 (V·m) 或牛顿·米²/库仑 (N·m²·C⁻¹)。 * 以SI基本单位表示为 千克·米³/秒³·安培 (kg·m³·s³·A⁻¹)。
In this course, we will be discussing electric flux, how to calculate flux, as well as the analogy with the movement of water. Suppose there is flowing water through a pipe at a certain velocity in a certain direction, say, to the right. Suppose there is a small cross-sectional area of the pipe. Then the amount of liquid flowing through the area in the unit interval of time can be written as vds. Suppose the area is inclined at an angle with the direction of the movement, then the effective area for the computation of the movement is given as ds cosθ.Similarly, an electric field is analogous to the movement of liquid in the analogy. But whereas liquid can be seen, the electric field cannot.Electric flux is the number of electric field lines per second through a given area. Although the electric flux is only influenced by the charge inside a close surface, the net electric field (E) can be influenced even by the charge outside the surface. In all situations, the application of Gauss's law is possible but is more easily applied when the electric field is highly symmetrical, as in the case of a sphere or a cylinder.The SI unit of electric flux is the volt-meter (V·m) or the newton-meter squared per coulomb (N·m²·C⁻¹). It can be written as kg·m³·s³·A⁻¹ in terms of SI base units.
