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. - - - - - - - - - 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 - - - - - - - - - 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 : https://youtu.be/8VN8MDn4CFA _ What is a field : https://youtu.be/_n_jRP8u1gI _ What is an electric field : https://youtu.be/hrHCj09_dpc - - - - - - - - - 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/ ) - - - - - - - - - Other credits The drawing of the sphere (Chanchocan Vector) was produced by: Nicoguaro, CC BY-SA 2.5 (https://creativecommons.org/licenses/by-sa/2.5), via Wikimedia Commons. It was then modified by Edouard Reny for use in this video. ... https://www.youtube.com/watch?v=ANXIdrb30dc

As a physics teacher, I can become quite amazed about how some students manage to go through chemical or electrical engineering courses and even pass their exams, without really understanding what an electric charge actually is! Usually, those students manage by learning the “rules”, but in the end, they do not get a precise feel of what they are doing. Confronted with a new situation or problem, they can end up feeling quite lost. This is why I created this course dedicated to Electric Charges! You can access the full course here: https://www.udemy.com/course/electricity-the-basics/?referralCode=640E55D087C7FDBE5110 Content of the course on Electric Charges: _ Episode 1 explains how a charge is actually a property, not a definite body or object. _ Episode 2 presents how a charge is quantified by introducing the concept of elementary charge. _ Episode 3 details the principle of conservation of charge. _ Episode 4 develops the fact that charges attract or repel each other. _ Episode 5 explains that the motion of charges forms a current. _ Episode 6 explains why some materials are electrical conductors, and others electrical insulators. _ Episodes 7 and 8 plays with static electricity by showing you ‘magic’ tricks. Of course, these episodes explain also what is really going on physically. _ Episode 9 is maybe the most important episode as it develops the real definition of an electric charge, using the notion of electric field. _ Episode 10 is a little quiz that will help you check your new understanding of the concept of electric charge. In addition, you can get free access to tons of free resources that will help you with your studies of high school physics by visiting the website: https://www.physics-made-easy.com/ This video is produced and presented by Edouard Reny, Ph.D. in materials sciences and private tutor in Physics. Edouard provides one-on-one private tuition in Physics (face to face or by Skype). If you wish to contact him, visit his website: https://www.physics-tutor.nl/ Music composed and produced by Edouard Reny © 2020 (https://synaptic-machines.com) ... https://www.youtube.com/watch?v=5nNz_QCwWhk

The reflection of light on a surface is a common phenomenon, so common that even physicist forget about the amazing physics involved. Under a classical physics perspective, light is an electromagnetic wave, in other words, light is an oscillating electric field. When the light encounters the surface of a material, the electrons of that material naturally oscillate because subjected to the oscillating electric field of the incident light. But… these electrons themselves carry a charge, thus produce their own electric field, that in turn oscillates too: that means that the electrons produce light also! We perceive that light as reflection (and refraction). The light emitted by the electrons is produced in all directions. Many of these rays are cancelled out by destructive interference. The rays of light that survive (resulting from constructive interference give rise to the reflection (and refraction) rules. Content of this video: 0:00 Why does light reflect? (introduction) 0:30 What is Light? 1:12 Effect of an oscillating electric field on a charge. 1:55 What is reflection? 3:06 Reflexion laws, where do they come from? 3:44 Why does light refract? - - - - - - - - - Credit: illustration of the water molecules: DiamondCoder via Wikimedia Commons, CC BY-SA 4.0. All other illustrations and music by Edouard Reny. - - - - - - - - - This video is produced and presented by Edouard Reny, Ph.D. in solid state chemistry and private tutor in Physical Sciences. For access to great resources that will help you with your studies of high school Physics, visit and subscribe to the "Physics Made Easy" website: https://www.physics-made-easy.com/ Edouard provides one-on-one private tuition in Physics (face to face or by Skype). If you wish to contact him, visit his website: https://www.physics-tutor.nl/ - - - - - - - - - ... https://www.youtube.com/watch?v=wiPHp-V30lc

Feynman diagrams are a graphical representation of the processes involved in particle physics reactions. This video is the first episode of a series of three that presents what are Feynman diagrams, how to understand and use them, and how to build them. In this episode you will learn what a Feynman diagrams is. We will use for this a well-known particle physics reaction as support, beta decay. Feynman diagrams are an insightful tool that puts to light the wonders of particle physics. The reactions occurring in particle physics are a marvel of processes involving the forces of nature (weak force, strong force and electromagnetic force). Writing these like a chemical reaction does not provide information about the processes involved, just what you start up with, and what you end up with. One can use the Quantum Chromodynamics (QCD) and Quantum Electrodynamics (EOD) to model quite well what is going on, but the mathematics involved is not for everyone! Instead, graphical representation of these reaction, invented by Richard Feynman, allow all to visualize the processes involved easily: Feynman diagrams. He introduced these originally as a graphical aid for visualizing and calculating interactions between electrons and photons. Today, Feynman diagrams are commonly used to depict all types of particle interactions. These videos are intended to help high school students with their physics studies as well as high school physics teachers wondering how to approach the topic with their students. **** Access to the Videos **** Introduction: Content review of the Feynman Diagram mini-series https://youtu.be/O9ihGuK53Ww Episode 2: Space, Time and Vertices. (presentation of the building elements of a Feynman diagram: space-time diagrams, the symbolism that is used, and the concept of vertex): https://youtu.be/JScJjZ9zW7A Episode 3: Feynman Diagrams, Let’s build some! (Learning how to build Feynman diagrams by example, using particle physics reactions like muon decay, pion decay, Kaon decay etc. https://youtu.be/vgk2aJRlBcg SUPER USEFUL - The table of particles: https://www.physics-made-easy.com/Standard-Model-of-Particle-Physics If you are not familiar with Particle physics, I recommend you start by viewing the series of videos that deals in detail with particle physics reactions: _ Introduction: https://youtu.be/gy-durcAhJ4 _ Elementary and composite particles of the standard model: https://youtu.be/AJSL39hVVPw _ Quantum numbers of particles: https://youtu.be/3SVMrLmGHWQ _ Conservation laws and particle physics reactions: https://youtu.be/E4JGzQjBgHg Particle Physics Reactions PART 1 is a reminder of the standard model of particle physics. It presents the elementary particles (fermions like quarks and leptons, and bosons, like the photon or the gl ... https://www.youtube.com/watch?v=TLBXrMixcu8