My new website: www.universityphysics.education Electromagnetic waves. EM spectrum, energy, momentum. Electric field and magnetic field. Doppler shift. Polarization. Song at 47:47 is "On the Border" by the Eagles.
Mo G, So sorry to wake everyone up with this nightmare! But if you're not annoyed, you might like my new website: www.universityphysics.education Cheers, Dr. A
I know this is an old lecture, but honestly, it's just so damn good. Not only does it teach the fundamentals in a clear and easy to understand way, but it provokes thoughts and ideas for the curious listener. This is a real gift to the internet.
He's writing normally. The video is flipped and there are screens in his class that he encourages the students to look at instead of looking at him, since all of the writing will appear backwards if they look at him.
I’m now 66 years old and remember loving math thru high school. Might be my only regret in life that I followed other successful paths. Magnetism and EM waves are the most intriguing things I’ve ever seen! Thanks for your sharing, can you imagine just starting college now?! Your drawings and explanations are awesome and inspirational! Thank you!
What is missed by everyone is the fact that space, "as Gauss stated, is not observable." It is the Electric Field that humans see and observe. The information which is transmitted to an observer through time is in the Coriolus component of the Electric Field ( has been referred to as the magnetic field). That information observed by humans is from the past.
I also found this video by falling asleep and then waking up 20 minutes in 😂. But this lecture is great! Everything makes perfect sense and is very accessible. What a time to be alive where you can watch a lecture this quality at 7am on the other end of the planet
Malik Amajjoud, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
Whether you like or hate a subject is always on the teacher. Good teachers get your attention just by the way they teach and how much they belive in what they teach. This guy is a good teacher and interesting to hear. All teachers should teach like this. Thanks, you are great.
41:27 equation: electric and magnetic energy density 1:01:30 equation: what is the total power output of the sun 1:14:30 lens can be intensity of the sun 1:29:00 righthand rule 1:32:00 red shift, blue shift 1:35:15 why is this only true when v is much less than the speed of light; what are the complications when the relative velocity approaches the speed of light[[?]] 1:36:00 equation for rotating galaxy 1:39:20 the galaxy is moving away faster than its spinning, so both points (including the one moving "toward" earth) are red-shifted 1:43:15 polarization defined as direction of the [[electric field]]; there are only 2 possibilities (for lasers and what else[[?]]): horizontal or vertical polarization = "defined polarization" [[?]]; incandesecent sources, like sunlight or a lightbulb, have all the angles = "random polarization" 1:45:35 glare tends to be dominantly polarized in one direction [[?]] how come it never happens that when you put on polarized sunglasses you end up filtering out the object's light and keep only the glare[[?]] 1:48:00 [[electric field]] peak value 21.7millivolts per meter ; power = energy per time ; intensity = power per area 1:57:15 sunlight pushes on you a little bit ; "radiation pressure" refers to momentum transfer between wave and radiated object aka "absorber" ; equation of momentum transfer 2:00:25 "this is kinda like what we talked about..." [[?]] 2:01:00 Force = Delta P (pressure) over Delta T (time) ; pressure = average intensity / [[speed of light]] 2:03:40 [[?]] 2:04:00 inside spaceship a sheet of [[teflon]] foil or [[mylar]] that expands when it gets into outer space; this is called a solar soil ; mylar is a big reflector: the light that comes in hits the solar sail and pushes the spacecraft 2:06:45 intensity of sunlight on earth is roughly 1400 Watts per square meter; this is about as much as a hair dryer 2:09:35 1/4 lb ~= 1 Newton 2:11:00 [[solar sail]] keeps accelerating with weight of a marble forever
This method of teaching is absolutely beautiful. I love his approach. The way he builds up from the basics and expands on it is simply amazing. One of the best teachers out there.
Dr. Anderson, the tools for teaching this make learning so much easier to understand, compared to physics taught in the 80's. So appreciate the cadence of your teaching. Just awesome! Your students are blessed to have you as an instructor. Thank you.
Brilliant! The teacher and teaching style. Engineering and science students of today are so fortunate to have access to such material and great teachers like Prof. Anderson! Keep strong, Sir!!
Excellent teaching! It is easier to follow the idea when the professor writes his flow of thought on the blackboard. The "front" blackboard is so innovative.
You Sir are an amazing teacher. If all my teaches, instructors and professors were like you school would have been a whole lot easier. Thanks for sharing.
I am a little over an hour into this video and I have learned more than I thought I ever would regarding Electromagnetic waves. Thank you for this amazing class!
His demonstration of current going up and down in waves as it changes polarity, causing magnetic waves to be generated at right angles to that (perpendicular to the electric charge) is brilliant. Some professors have the ability to take a simple principle and make it incomprehensible; it's much rarer for a professor to communicate principles so that everyone can understand them.
GENIUS! Someday ALL university physics "conversations, lectures, and problem solving" will be taught this way! Learning Glass technology, mirror image of Dr. Anderson "facing" his students, and his enthusiasm, explanations, texts, and illustrations projected normally -- all this makes learning personal, inviting, clear, and mutually fun for BOTH sides of the Glass! LOL for Dr. Anderson's "reverse-image-corrected" right hand rule explanation at 1:22:27 in which he has to use his actual left hand (with wedding ring) to project the image of his right!! This is a game changer for higher learning (like Dick Fosbury's "then-new-approach" to high jumping in 1964)!!!
Arden, Wow, thanks for this, it really made my day. And also made me feel a bit old for knowing about the Fosbury Flop! Thanks for the comment, and keep up with the physics! You can also converse with me and my team at my new website: www.universityphysics.education Cheers, Dr. A
Arden, I have a favor to ask. We would like to use your quote in some promotional material. Would that be okay? Email me at info@universityphysics.education Cheers, Dr. A
@@yoprofmatt You should describe the technology you're using for this in the video description. Its a clever use of physics. It'll also get the word out.
@@yoprofmatt Dick broke high school records in 1964-1965, set collegiate records in 1966-1967, and won Olympic gold in 1968 with a new Olympic record. By 1972, the straddle technique was obsolete, and the Fosbury Flop was THE new standard for almost all high jumpers! Best anti-aging agent? Innovation through new ways of teaching, new ways of learning, new ways of understanding of course! The "nota bene" that curiosity and persistence can sometimes turn out to be challenging AND fun is a bonus whether jumping over a bar or learning physics!
well i searched for this video and i was lookin for something to change my perception that how mechanical transverse waves transfer energy and how em waves transer energy and after viewing this whole video it was no less than an enchanting lesson that no worldy thing can match. thanks and more power to you prof.
I wondered, what are the odds of being able to write backwards, AND write backwards well, AND write backwards well...left handed. At this point I realised that it's far more likely that you're using a video camera to invert the image. Then I realized how cute it was that you demonstrated the Right Hand Rule using your left hand. lol
I write with my left hand and I can read and write backwards fairly well so I didn't even think about this at all until I saw your comment... I can also write with my right hand though and write mirror images simultaneously with both hands that look similar. I cannot however, write different things with both hands at the same time.
@@gustavofoss2280 I've been pretty busy lately so it took me a little while to get around to doing this. I hope this counts. I also hope RU-vid lets me attach a link like this because this is the first time I've tried to link a video. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-8p9ovhYgACY.html
I remember learning about EMF when I was a kid (early 70's) - via the ARRL it is a Ham radio thing - it changed my life and started my life being devoted to science
Thank you for that. Well put!! My previous experimentations with the "B" field , about 2 years ago began quite simply after reviewing the Coral Castle installations I realized that after seeing that his generator was built to maximize the "B" field by using "V" magnets I wanted to see what effects the "B" field had on ordinary rocks . So I went to my front yard and picked up a stone and weighed it , 38 Grams, then I was carful only tap it with the "B" field of a magnet , It dropped in weight to 22 grams. I believe the key is to find the correct frequency to vibrate the "B field and it should float.. No wonder magnetic rocks were called "load stones
I watch educational youtube videos because I cannot tolerate all the commercials on TV. I have been looking at DC motors and magnetism and running across this class was fortuitous. The professor is excellent ! Really.
Wow, Dr. Anderson is a great teacher. He makes physics so clear and understandable. What a gift he is to teaching and science. When I first started watching this video, I thought, OMG an academic is about to make the difficult to understand even more difficult and I just may be wasting my time. Was I wrong! What a surprising blessing, for sure.
I agree. I've had professors who try to dumb down material WAY too much and I've also had professors on the other side of the spectrum who make things so difficult to understand. I'm glad Professor Anderson has achieved that healthy teaching medium.
Is the Earth gravitationally attracted to the position of the Sun, ~8 minutes ago? If yes, bye bye coherent solar system. If no, C is not a speed limit and something must be communicating instantaneously. Or I need more information. Thanks.
When you gave the example of the Sun for visible light, I thought that maybe it would have been good to add that the Sun isn't limited to visible light. Thanks.
Can waves propagate through no medium? Have you contemplated the existence of a medium in "free space"? Could a test, better than P&W, be devised to double check with more rigor? When you shield an antenna from the microwaves coming from the Earth's oceans, according to data from the Herouni Antennae, you do not measure any Cosmic Microwavve Background. Why don't we try that and why didn't we think about doing that before? Also, when light slows down through a medium, such as glass, how does it speed back up to C after it passes through the glass? Doesn't C actually fluctuate, except that it's tied to the meter, making the meter fluctuate? Thanks!
I think your lecture is wonderful. I understood this as a child (I am now 72) as I was coached by my uncle, a chemist at ORNL, but have found few people that can comprehend or care about such things. But we love what we love. I would like to just randomly add that heating the concrete you mentioned around 1:15:00 is something I did a few years ago with a carbon arc. I think it was arcing at about 36V @ 70A. It ended up being a bad idea as apparently the water vapor in the concrete caused the hot-spot to explode (after becoming red hot) and blow very hot pieces of concrete all around and into my face. I was not injured seriously but it taught me a lesson that extreme temperatures (or anything else) can do unexpected things. Lastly, even after all these years, I still enjoy a good presentation like you posted here. I know it has been seven years since you posted but please keep up the good work and enjoy life. I know it would be subjective but it would be interesting to plot real-time ageing years with perceived ageing years as we grow older.
Everything a teacher should be. Walks you through it from your perspective even though you know he knows it. Asks questions you can answer to keep you engaged.
17 minutes in and your teaching methods for these phenomena are a real treat. Seriously to anyone who is just starting their journey in science hang on to every word of this video. It will bring a level of clarity to so many concepts that I as well as many of my peers have just shrugged their shoulders and just figured out the math and never thought of the deep mechanics of it all. I’m 25 and this video just unified such a huge part of my education in a way I can’t even describe.
Layne Rollheiser, That is music to my ears. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
Light bulb moment! When you get it... Almost EVERYTHING is simplified. I had mine about 30 yrs ago watching a show called "Connections" With James something on the Discovery channel, back when you actually learned something. Then later in college it was solidified with two factors, Atmosphere, and Frequency. Michio Kaku , (spelled wrong I'm sure) is another great teacher that lead to my own👉 "light bulb moment" 👈
Thank you Prof. Anderson, this is an amazing video - I'm doing a subject as part of my masters and the amount of information I have to research is enormous. It's all about wireless communication and EM waves. Thanks to your video I finally got the basics of it. Keep up the amazing work.
Apparently, I'm not the only one who fell asleep on RU-vid and woke up to this. It's an amazing video to wake up to tbh. RU-vid algorithm doing it right!! I went on to get my Master's degree in Information and Digital Communication, but I have always had a passion for physics. This goes right in the feels! Thank you for this amazing course!
I completed my schooling 40 years ago. But this is first time that I really understood the concept. Thank you very much for the great way of teaching 😊
Not only is this amazing in terms of content and easy comprehension (only 30 minutes in), but can we all just admire that he is writing backward on a transparent board. I’m sure some may find that common, but to explain it so well without skipping a beat and everything being so legible. Major kudos. I will now be subscribing.
He is a gifted teacher. He expresses difficult concepts with such an ease and eloquence. Very few prof are of such a high calibre. I wish he was my physics teacher when I was in grad school.
I've been sleeping in a hypnogogic state while listening to these lectures in my dreams. It's amazing how much I'm learning while my dreams listen in and put me in a cool classroom and different experiments with what he is explaining. It was like watching my own show on discovery channel.
No kidding. Clear and writes/draws so well (backwards for him) and he's a lefty too. Ya gotta wonder if he's chimed into what's coming . .the EMPCOE catastrophe. Lights out 3 days, INSANE ELECTRO MAGNETIC PLASMA CHANGE OVER EVENT STORMS, HELL WEEK. He knows the true workings of our flat earth plane
i honor your name Matt Anderson for the quality of your lesson(s) and your contributions to Physics! Thank You Father, all the glory and praise be to You! Your creation is amazing!
I was cleaning up round the house while listening and I saw the light refracting trough the glass door forming a rainbow and I realised I was seeing a Fourier transform right in-front of my eyes, it’s funny because I already understood and knew about these concepts individually but hearing it put like this together has blown my mind how all of these things are the same thing.
Regarding the diagram at the beginning of the lecture: wouldn't the magnitude of the electric field at the midpoint get larger as the two oppositely charged point-masses move closer to one another? My reasoning is based on the 1/r in the electric field formula and superposition. As the charges move towards each other, the r term gets smaller. (edit): I was assuming that the E-field being plotted was that at the midpoint of the point-masses. Is that correct?
E filed of a single charge would get larger as we get closer to what is the midpoint of two oppositely charged point charges, if there were a single charge. But we have two charges. When the two charges overlap, are at the same point, the net charge is 0. So Dr Anderson is right since, no (zero) charge produces zero field. If you think of a point charge as a very small sphere of uniformly distributed charge, even then l, by Guass's law, the field produced at the center would be zero. As we approach the center, the distance from the center varies linearly. The 1 over r quare term in the field varies as 1 over r square but the enclosed charge varies is 1 over r cube. So the field falls linearly as r.
Very true! In fact, I too was thinking about that. He's right when he's saying that those oscillating charges produce oscillating electric field but not because of the reason he's saying. It is because of the acceleration of particles themselves. In SHM, the particle's acceleration is proportional to the displacement from the mean position. This implies that acceleration is zero at the mean position and highest at the extremes. Now, since the electric field is directly proportional to this acceleration, we see the electric field also following this "displacement analogy". The farther the particles, the higher is the acceleration and the higher is the electric field and vice versa. Hope this clears your confusion.
this is really interesting yet I can't help getting sleepy with this, I'm starting to use this as ASMR for sleeping and returning back the next day to where I remember lol
No, the length is good. The prof at my university always tried to cover a whole chapter in 20 mins video. So I always read the book and went to your vids when I was confused about the concepts. Great that I had been having high A's in the past exams, now just one more final to go and I am gonna rewatch a few of your vids. Thank you again, and Merry Christmas to you and your family!!
@@yoprofmatt Excellent lecture Matt, I'll have to watch the others you've done. Presuppose this, if you were living in a closed system & the Sun was within that system how would this effect what you have transcribed..... ?
Prof Matt.Please,can I get your video lecture on how to Deduce the Electromagnetic wave equation for magnetic field strength using the uniform plane wave components.
I had this recommended to me and watched it willingly, because I like the format and it seemed interesting. It is and I'm happy with it...I did fall asleep about 90min in.
I love this. The way he explains and teaches these concepts and theories. Has made it very easy to understand and digest and also how to understand the way these examples works in the real world.
Thank you for the great lectures on the electromagnetic wave. l particularly enjoyed the section on the antenna. Any recommendations on books for this subject?
I did also fall asleep and woke up to this, but you have such a nice voice and this is really interesting with how you explain and visualize everything
If only had I had him as a professor, I would have found physics much more palletable. Great course, demostration and explanations with visual. Clear drawings, enunciation and clean delivery without bouncing all over the place. Fun video to watch, I actually learned something new.
Marek'L Whip, Sounds like a nightmare. Hope I didn't scare you. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A
I wish I could have had a teacher like you, when I was in school! All physics I have learned, I have teached my self after I reached 30 years old. That's mainly because bad teachers. Thanks for this video!
_" That's mainly because bad teachers. "_ yeah I tried Open University & it just wasn't that great an explanation so i gave up. Before that I tried a book called Engineering Mathematics by Stroud. It was awesome & so easy even degree level stuff. Another great teacher on RU-vid is DrPhysicsA
Ahhhhh i keep wiping my screen where his missing bits! other than that a great vid, nothing better than neo himself explaining parts of the matrix, Thank you MR ANDERSON.
This seems a simpler than the heat-light-sound physics I had in college. It's still fun and informative. I am nearing retirement age and I keep toying with the idea of going back to school for a PhD in astronomy (which would mean an in-depth review of physics and algebra and trig and calculus and diff-EQ, etc etc etc). It's big commitment but it's not as if I would be in any hurry.
i literally subscribed to this channel in my sleep this is crazy not only am i waking up to this (no complaints from me this is amazing to watch from time to time) but i’m also going around subscribing to random channels i end up actually liking
I am so impressed when you use the electric dipole to give a picture of EM waves. But I am curious that why the current at the endpoints correspond to the maximum current, and that at the middle correspond to a zero current. I just think that the velocity of the charges will be zero at the two endpoints. Since J=rho * v, the current will be zero at the two endpoints. But that will not give me the right picture of EM waves. Can you tell me what's wrong please? Thanks very much!
This guy is really lucid and he is very skilled at presenting those illustrations. You can see that this isn't the first time that he has rendered those illustrations on that transparent surface. Not as easy as it looks.
1 hr in and I just realized that you're writing everything backwards from right to left.. The amount of practice this must have taken is a dedication to teaching that should be commended. Thank you!
Really thanks a lot, an amazing class, I´d like you to activate the subtitles in this video to help people who speak in other languages, I can help with Spanish. Greetings from Chile.
This is some great instruction (Not to mention free...Thanks!). However, I'm having a hard time conceptualizing how EM waves would travel along a solid medium such as a coaxial copper clad cable. Do the EM waves propagate THROUGH the diameter of the round center conductor? Or do the waves spiral around the outer edge of the center conductor?
Your videos are amazing, I stumbled onto you when learning most people incorrectly understand how electricity “works”, I’m definitely a fan, but this video ends abruptly.
Being a scientist is my hobby and I am starting to revisit the sciences because I now have the time to do so. Your point on the duality of em spectrum is actually true at any point of the spectrum because everything is truly made of particles and depending on your distance from the point of the spectrum every point becomes a wave. Do you agree with this? I am correct to make this conclusion? I am looking at this on point of view of chemistry.
Kind of a late comment but you are correct, the reason things like gamma rays act like particles is because they are oscillating so extremely fast that when viewed over a longer distance it is almost indiscernible from a straight path. Shorten the distance enough though and you will be able to make out the wave like path that you typically see with all EM waves. On the opposite end of the spectrum you have the exact opposite. With low frequency radio waves they travel in long drawn out waves making them act more like a wave than a particle traveling through space. So when viewed over a longer distance they behave like waves. However, if you shorten observing distance, the waves are so stretched out that their path then when viewed over that short distance it looks like a straight line because of how gentle the oscillations are. I hope this helps if you never found an answer to your question.
This is awesome! I'm so glad I found your channel. I really love physics, but unfortunately HS doesn't offer anywhere near as much detail as I like. I plan to major in software engineering for practical reasons in getting a job. However, I plan to try to get a master's in physics when I'm older, after making enough of a living beforehand.
You saved me from getting in trouble, I accidentally fell asleep with my computer on watching memes, and it ended up going onto this video, the downside is that now my dad is purchasing physics books and stuff like that.
thank you for making physics seem so simple. I was taught physics some 30 yrs ago where the teaching aids were just a simple chalk and a board.. usually black, and of course half the time you're just looking at the teacher's back.. and if she was a beautiful curvaceous teacher, young testosterone filled young minds like mine was back then, your never really paid much attention to the board .. really.. so thank you for your beautiful explanation and your smart learning glass style teaching..
question why isn't the b field a cos wave . Because if we see the slope of E field at points near the origin we have dE/dt maximum and Maxwell equation describes when change of electric flux is maximum magnetic field induced is maximum. I cannot find this answer if u have time plZ solve this querry.
Such a simple and flawless explanation with every minute detail. Loved it. Thank you, ♥sir Anderson...your lecture makes us curious to know everything in detail.
