In order to fully grasp electromagnetism, one basic notion that is absolutely essential to understand is the concept of Flux (For example electric flux and magnetic flux).
This is what this video is about! The first section provides an approach to the concept of flux within classical field theory. Then, the second section uses the idea of electric flux to present a major law in electrostatics, Gauss Law.
Finally, at the end of the video and as a direct application of Gauss law, the teacher derives the well known Coulomb’s law that quantifies the force between two electric charges.

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Structure of the video:

00:00 Introduction
00:48 Content of the Video
01:59 What is flux ?
05:57 How to calculate flux
08:35 Gauss Law
11:00 Gauss Law: why is the flux independent of the Gaussian Surface ?
12:44 Gauss Law: why is the flux only depends on the enclosed charge ?
13:32 Deriving Coulomb’s law from Gauss Law

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In order to fully grasp the content of this video, the viewer needs to be familiar with the following concepts already presented in a PME video.
_ What is a charge :    • What is Electric Charge? (Physics - E...  
_ What is a field :    • Electrostatic Physics, It's Magic!  
_ What is an electric field :    • What is an Electric Field? (Physics -...  

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The script, the illustrations (Except the drawing of the sphere – see other credits section), the music and the video were produced and presented by Edouard Reny, Ph.D. in solid state chemistry and private tutor in Physical Sciences.

Edouard provides one-on-one private tuition in Physics (face to face or by Skype). If you wish to know more about this, you can contact Edouard or visit his website: https://www.physics-tutor.nl/ (Or this one for French speakers : https://profdephysique.fr/ )

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Other credits
The drawing of the sphere (Chanchocan Vector) was produced by: Nicoguaro, CC BY-SA 2.5 (https://creativecommons.org/licenses/..., via Wikimedia Commons. It was then modified by Edouard Reny for use in this video.