This website contains all my 94 course lectures (8.01, 8.02 and 8.03) with improved resolution. They also include all my homework problem sets, my exams and the solutions. Also included are lecture notes and 143 short videos in which I discuss basic problems. ENJOY!
+Lectures by Walter Lewin. They will make you ♥ Physics. Thank you very much for uploading these videos and files, they are really fantastic and interesting lectures. :)
One of the reasons, yes. But also the facilities and the innovation-driven spirit of MIT. The institute seeks to push forward the STEM field. Sadly many of our Schools don't have that spirit.
Dr. Lewin, I just wanted to thank you! I'm an aspiring EE and my professor for physics 2 at my community college goes through a chapter every 40 minutes. No demonstrations, skips over half of the slides and then doesn't really cover the ones he sticks on. Your lectures are a great resource and make physics more fun to learn!
Hi Dr. Lewin. I never get to like physics in my whole school life. Your lectures are so Articulate, patient, organized that it really glue me to the chair for 50mins. and more. Danke shune...sorry for wrong spelling.
+jessica galen Hi Jessica, I am not German, but it's nice that you tried German. shune ==> schon with an umlaut on the o. In Dutch (I am Dutch) "veel dank" or "hartelijk dank".
@@lecturesbywalterlewin.they9259 i can't believe...being the brand teacher of physics ..u still reply to our comments sir.....hatts off 🙏🙏🙏......u r too grounded at the same time u r extraordinary brilliance.......hoping that i could ever get ur blessings
Mr. Lewin Thank you so much for these very interesting and frankly amusing lectures! I'm only a high school student (16 years old) but in my school we don't conduct experiments in any way, shape or form, unlike you do here. That's one of the many reasons I'm watching 8.02 right now. And l find it really glorious and intuitive to watch you explain everything so explicitly and practically. You are a great professor. Thanks!
I'm 16 and I'm going to college.. most of my classes are super easy but I didnt at all understand physics II until I started watching these. Thank you so much!
Prof. Lewin, I learned about your lectures when I was still in high school and now I'm still watching them as a graduate student albeit in mathematics. Thank you for never failing to inspire.
Thank you, Professor Lewin. I still get something new ( and of course refresh my knowledge about electromagnetism) by watching your lectures even if I DO believe that I am good at electrodynamics.
If I had Walter Lewin as my Physics teacher, I would not be an artist now. I don't know if it's a good thing or not, but now I work as an art teacher. And I usually put physics into the concept and theories, because art contains physics. the color theory, the material, structure, everything is connected to physics. Thank you Walter Lewin for this amazing lectures.
Hello professor, you have always been my source of knowledge in physics since 9th grade. Thank you for your amazing lectures and I have never seen a person more passionate for physics as you are !!!
I envy you!!! But i am also so grateful beacose these lessons are online. it is a great work for the world, especially for us who did not have access to quality education!!
Thank u for your great lectures.Really your lectures made me love physics and today i suggested my freinds to watch your videos lectures because i am sure that they will also start loving physics after watching. now physics is no more boring for me thanks a lot professor Lewin
Thank you very much, Professor Walter Lewin. I'm an international student at your Alma Mater in the Netherlands (TU Delft) and I just got the result of the exam "Physics for Mechanical Engineers". Your amazing lectures helped me not only to pass the exam but also to digest and understand the importance of physics in my future career. Thank you a lot.
I was struggling so hard to grasp the physic concepts since my professor basically only skimmed over the material. RU-vid has been a great help and this professor makes the concepts easy to understand. Kudos!
0:20 Flux and electric flux, explain dA, n roof, closed surface... Prove Gauss’s Law, simmetry 13:40 some examples 1. Spherical symmetry (how to choose closed surface, symmetric arguments, some amazing results, E(r) graph, coulomb law vs gauss law, 1/R^2, point charge at centre~ Newton gravitational Law) 24:00 2. Flat horizontal plane (3 conditions to choose the Gauss Surface: parallel, perpendicular, d) => an amazing result (1 plane/2 charged planes) , maxwell’s Publication. - an amazing experiment with Van der graff and infinite plane => Extremely interesting 41:00 experiment: The Electric field inside the spherical charged is zero 46:50 experiment: 2 charged planes (very strong EF inside 2 planes)
I used to love physic. My collage teacher made me hate physic but for that teacher's exam, ı am studying with your videos and ı started to love physic again. Thx you :)
In my high school classes my teacher used to teach me physics in a very cool way but after two years i changed my school and now my physics teacher is making physics very boring (just using maths) . So i came here to enjoy physics ❤️
Sir, can we prove mathematically, using electric field lines and their vector sum, that electric field inside a charged conductor is zero? If yes, give me the proof, please. If not, why?
Sir, the video i found in help session is about solid sphere but my confusion is about a hollow conducting spherical shell. Without using Gauss's law, q = 0 inside a hollow sphere, can it be proved that E=0 using vector sum of field lines.
Ok sir, I think i got it. If no charge, no field lines are coming in or going out. If charge is outside then the number of lines coming in is equal to number of lines going out, so no net flux and no net E field. Correct me sir if i am wrong anywhere.
>>> If charge is outside then the number of lines coming in is equal to number of lines going out>>> That is not correct. Maybe I misread this. If a + charge is outside of a hollow spherical conductor field lines are ONLY going away from the charge, thus ONLY going out.
Excellent way of making physics so simple... Sir i have been watching your lecture 6 years now... Whenever I watch any of your lecture feel like stick to it forever... Thanks a lot for making world to understand physics so simple way... 🙏👏💐🌷
i can't express how benefit this lectures for me. Ive had always had struggled with electrodynamics but this is really enjoyable thank you walter lewin ,i see you as one of the greatest scientist
Oh! I wish I could have such an amazing teacher here in India coz In India most of teachers would only concentrate on completing syllabus they don't care about student's interest ....god please bless me with such great teachers
I always knew what electrix flux was (like the defination and the math behind it) however I never knew how to apply it in later concepts and studies, after watching this lecture I have finally understood what electric flux is actually supposed to solve. Thank you so much
I really loved your lesson! I learned a lot, I wish I could have such an amazing physics class here in brazil! Thank you, I'll definetely watch more of your videos later.
I wish the same! but i am so thankful for this videolessons! It is a great oportunity to understand and love physics as it sould be. Greetings from Paraguay.
This syllabus is congruent to class 12 syllabus.......very excited...we xqn learn academics by an extraordinary teacher...#hatts of 4 u dr.lewin sir....for making our childhood awesome
I've never seen anyone like you in physics before. You have given us incredible information . Thank you for the lecture . Hello from Hacettepe Universty🙂🙂
Wow, calculus 3 and a understanding of vectors is needed to fully appreciate these lectures. At my college just single variable calculus is required to be able to take 8.01. I was lost with all the vector notion used but I still managed to do well. These lectures make so much sense now that I have a better understanding of vectors.
I really like your videos sir i dnt knw about your videos but the sir from lighthouse channel has suggested in almost his every lecture about your videos and i just loved it....Thank you so mch for being an amazing teacher
I am studying for my Physics 2 final and your lectures had help me all over the semester. Thanks! Such an inspiration. Thanks from University of Puerto Rico at Mayagüez, from a Chemical Engineering student ☺️
For those who didnt understand the 45:12 concept as he is connected to ground he transfers some electrons from ground to the charged plate which is not perfeclty charged in order to neutralise all positive charges in that plate and hence increase the negative charge of the plate for his perfect experiment....hope it helps
I am in 2nd year college pre-medical currently we are studying electrostatics in class which was kinda boring until i found your lectures your passion to teach physics is amazing the way you teach with complete dedication and love.Teacher's like you prove to student's like us physics is indeed beautiful thank you sir!.
you are even more than an amazing physics teacher, I think, on earth, after getting your few lectures, I realized that you are truly the best physics teacher on earth at least, cause now I literally begun liking physics a lot, thank you for helping millions of students to do well in physics, thanks once again, respected professor.😀😀
What I love is how you challenged the students to figure out the flat plane E field.. I tried it out for myself, and because of the big hints you gave I got the same equation luckily! :) awesome lectures
Sir, could you explain why Gauss's law holds true for non spherical, irregular surfaces as well? I cannot find a good explanation of it anywhere online. Thank you!
I am learning about this now in my lecture class and it's nice to bounce back between my professor explaining it and you explaining it. My professor went to MIT as an undergrad before you started teaching in the 1970's. He is excellent at explainable things and emphasis's the concepts much like yourself professor : )
@@lecturesbywalterlewin.they9259 Noone is like you sir, but my physics teacher is also as amazing as you. He also connects the theoretical physics to practical physics. He is super expert teacher for Jee Advanced exam.
@@lecturesbywalterlewin.they9259 He taught me gauss law, electric flux, fluid dynamics, neucleus, work-energy-power, gravitational force, totational motion, centre of mass and many other concepts.
Hi Dr. Lewin. I am watching your lectures from the very beginning ( starting from 8.02 and then will move to 8.01). I am watching these with the aim of scoring full in my this year Medical entrance test 2022 (Pakistan, I am from).I have a fear of Physics in me, I want to convert it to love for physics because in order to become proficient in Human anatomy (important for medical profession) you need to be in love with Physics, Chemistry and Biology altogether. My exam is somewhere in October/November. Watching YOUR lectures along with focusing on book, will let you know at the end of my last video(your last lecture, obvio) that at what level I feel I am interms of Physics at that time. Good day to you!!
I thought Gauss is just: what comes in comes out. But it is beautiful, that E*A anytime keeps the same (just becaus it is proportional to 1/r^2) without a charge in a closed surface. By the way, when I am not motivated for school, I am always looking forward to watch your lectures when I have time. Geat thanks for publish them.
Sir, you know if you take a very large uniformly charged hollow sphere, the E field is independent of the distance if you are relatively close to it. Its value can be given by sigma/ε zero Same as two planes with same charge. I discovered that while revising this chapter 😊
Sir, The first thing I want to know that in the last experiment, where a ball oscillates in between the plates, if, the neutral ball was held at first in between the charged plates, without touching any of them, and then allowed to move, would that remain at rest or somehow will start to oscillate? Does Earnshaw's theorem have any application here? The second thing, while touching the above end of Electrophorus to transfer the negative charge to the earth, were you wearing shoes? Then how do the charges move to the ground? I will be pleased if you answer these doubts. Respect and Love from India.
Hello, professor. As a high school student, I have trouble understanding exactly what symmetry arguments are. I have done several google searches but nothing worthwhile came up. How can I familiarise myself with the concept? Is it in Maths or Physics? And I know that you've heard this from millions of students already but thank you so much for these lovely lectures. I hope you are having a nice day!
I would definitely say at this point Calculus 3 would be very useful, and he maybe skipped a couple steps when discussing Gaussian surfaces assuming you would understand what he meant by choosing what the surface should be. Also, I think the flux explanation leading into Gauss's law needed a little more to it. As for symmetry, it would be helpful once you've worked through the math to follow a textbook and do the examples and view online solutions.
don't over due the learning curve. you need to fully understand trig and algebra to understand what he means by symmetry. The radius is the same distance along the surface of the circle with radius r. because of this it does not matter where on the surface you relate the electric field to AS LONG as the charge is uniformly spread on the surface. This is because a sphere's surface is the same distance to the origin with respect to whatever radius you assign it.
and Geometry. As fundamental as people make these classes seam, they are really the foundation of everything in physics. without basic understanding of such concepts you will only set yourself up for dissapointment. step by step.
the net charge on the conductor will be zero. charge density at the surface (both + and --) will depend on geometry. The conductor will be an equipotential everywhere - at its surface, inside the conductor and inside the cavity.
I was interested in physics in my childhood but when I was in school physics classes were boring my interest was lost in physics. but when I saw your lectures now I'm in love with physics .
I like how the spherical charge model can be understood with gravity. Curious that if gravity was electric in nature that we would likely experience the same results On a spherical plane such as the earth.
Thanks a lot 😊 you are awesome sir It is hard for us to watch experiments like this to understand theories it is so helpful and it has increased my interest in physics 😊
Sir your lectures are amazing. I have a doubt - in the experiment in which you showed there is no field inside a hollow sphere, why did you keep touching that plate before placing it on the sphere?
professor Lewin , I love physics too much . And your lectures are also extraordinary full with tremendous tranquility . I am an Indian and a big fan of you . I will be greatful if you give some advice how to be more broad minded in physics . thank you.
44:57 electrons are going from the metal plate to the ground when you touch it, leaving a net positive charge on the metal plate. The important thing to note here is that the metal plate is maintaining contact with the glass when you are touching it, if you pick up the metal plate and then touch it it will lose it's charge
Hello Professor. Can you give me some tips about how to solve problems like what strategy to remember, etc because I can very well solve all the conceptual questions as I have understood the theory well.. But I cannot solve some difficult problems.
There are 140 problem solving videos on my channel. I did these for MIT students. They are called Help Sessions. 84 8.01 and 58 8.02. Watch 5 of them every day. In one months you will be at the top of your class!
Thanks a lot professor. Since I have started watching your videos and seeking help and advice from you.. It's like a dream come true that Physics has started becoming easy. Lots of love from India. ☺I️ had a doubt.. What if for the Gauss ' law we put the charge q not at the centre but anywhere else.. The solid angle for the 2 areas comes out the same but what to do next and what to integrate?
Prof. When we derived Gauss Law using concept of electric flux we kept charge q at te centre of spherical shell. How to derive the same if charge q is not at the centre but anywhere else inside the shell? Thanks for the video link anyway.
@@mr.mirror1213 I took this in high school, yes, but theres nothing wrong with someone struggling to learn because it means they're interested and thats what matters in the long run
i m 14 yr old from India and i have studied these stuffs 2 months before covid-19 and i smiles when i saws these high lvl professors...... as a avg Indian kids has been studying these at the age of 14-16yr and if anyone is preparing for competitive exams as JEE in India...... i would probably says that he knows more than what been teached to him in his bachelor degree from MIT.............. for eg- Chirag falor knows everything that is been in his course ....BS program in physics at MIT😁😁 but there are pros and cons of each side, if anyone ask him how many practicals he had done in India,, probably he would not answer his/her question ........ 👍👍👍
