The electric flux is proportional to the number of electric field lines going through a surface. This animation illustrates the 3 parameters influencing the electric flux: the area of the surface crossed by electric field lines, the magnitude of the electric field and the angle between the electric field and the surface. In the animation, the electric field lines are green when they cross the surface, and become yellow when they don't cross the surface.
Other animations by Yves Pelletier
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