Thank you so much. You just made sense out of three class periods in 10 minutes. What the heck are we paying so much for at these institutions of higher learning???
@Alan_is_here
8 жыл бұрын
+Thomas Showers I left my tutions for a while ago for greater good
@michelchaman6495
7 жыл бұрын
It's so you can buy a piece of paper that says your trainable, and so people can hire you... yep.
@xXxFaLLeNxShaDoWxXx
7 жыл бұрын
They don't teach grammar do they?
@ajpurvis2251
7 жыл бұрын
The cake is a lie
@smokeypillow
6 жыл бұрын
for a piece of paper that will help you get that money back
@1973jdmc
8 жыл бұрын
Thank you so much. Some people are born with the gift to teach. You sir are one of them.
@keithwallace5277
7 жыл бұрын
not really but it still helped alot (by using Gauss law on and equation that we already knew)
@learnwidmk5898
3 жыл бұрын
what are you today?
@نورالہدی-ف7ك5ي
3 жыл бұрын
@@learnwidmk5898 a mom ☺😃💐
@نورالہدی-ف7ك5ي
3 жыл бұрын
Mother💯👍
@scott2e
9 жыл бұрын
Wow, that was much better explained than my lecturer's effort. Cheers
@carlosolmeda8357
9 жыл бұрын
Your way of teaching is more than excellent. Thank you very much for your videos, it helped me a lot.
@anshul9856
7 жыл бұрын
At 7:55, it should be parallel and not perpendicular
@vijaysinghchauhan7079
6 жыл бұрын
yep I think he forgot to consider the area vector....😀😀😀
@ziko2010tito
6 жыл бұрын
nope , the E ist perpendicular to The Area which is dA but parallel to the normal Vektor which is the Vektor Area dA ->
@99redninjas
6 жыл бұрын
I think he means that E is normal to the surface which means that we integrate in that direction. So technically, yeah, it's parallel, but I think it's more commonly thought that we can get rid of the dot product if E is is perpendicular to dA in the sense that dA is that spot on the surface.
@sah75_boss42
5 жыл бұрын
Liquidmaximo how ??? then saying perpendicular will make angle of cos ratio 90 degree will make entire product zero.
@TheHiddenChronicle-b9l
5 жыл бұрын
Sike nigga
@LameGeneration91
9 жыл бұрын
in my opinion, calc 3 should be a pre-requisite for this course. Believe me, everything that's in physics 2 makes sense now after finishing calc 3 !
@futurestar3348
9 жыл бұрын
+محمد العتيبي Yea but all you do is Integration. Physics 2 is merely just an introduction. Guass's law Is used for Electrodynamics, but there are way more prerequisites for that class.
@joshuaaguilera6666
5 жыл бұрын
I'm taking Cal one and this Physics at the same time. I get your pain
@JJSmalls
5 жыл бұрын
Same thing I was saying when I took Statics and Dynamics (combined). I would have been better off if I took Cal III beforehand.
@drnour5247
3 жыл бұрын
Asking for advice please! Do you recommend studying this for a high school student? Especially that I'm not that much taking calculus- based problems but I do need to start taking it as our school curriculum is gonna be depending on it
@LameGeneration91
3 жыл бұрын
@@drnour5247 I don’t know, a high school student preparing for this might be an overkill .. if you wanna do it yeah sure, but I didn’t do it while I was in high school and I had plenty of time to understand it afterwards in college .
@princeistalri7944
10 жыл бұрын
Lasseverin, you are really good at getting concepts across in a clear way A gem of YT reviews and lessons. I've yet to watch a lot of your videos, so forgive me if you've answered this, but are you a physics teacher/professor?
@louiethelooper4604
9 жыл бұрын
Excellent series on EM. Thank you!!!
@harshitakitchen
8 жыл бұрын
I cannot thank you enough for making this video. Hope my teachers were as good.
@wolframalpha8634
5 жыл бұрын
At 7:55 E is parallel to dA hence if you take the dot product E • dA = E dA cos(0)= EdA
@alwaysdisputin9930
3 жыл бұрын
TY. He should've said this.
@bucketrance
7 жыл бұрын
OMGGGGGGG this guy exactly knows the intricate problems that us students have understanding... Loved it thank you soo much
@heliossol8375
5 жыл бұрын
One decade later, and your videos continue to bless despairing students
@CountD42
11 жыл бұрын
I can't explain how happy this video made me. This is the best video on Gauss's law I have ever seen. I'm a 3rd year ECE student that never quite grasped Gauss's law, and this makes perfect sense. Thank you so much.
@AlfnnanVip
11 жыл бұрын
I like the way you explain, very calm and slow, make students understand uncommon sense concept!
@awesomises
8 жыл бұрын
I actually had little idea of what you were saying until the last second. Thank you.
@PhantomBlank
12 жыл бұрын
this is something that my professor could not explain to us in a understandable way like you, thanks you.
@nwilkins55
11 жыл бұрын
you have saved my ass on so many quizzes/tests thus far in these two semesters
@SHITONASTICK1100
13 жыл бұрын
wow.... you can really teach, like very well!!!!!! i'm impressed. i genuinely am shocked u just put my lecturers to shame and your not even getting paid for this. Thanks alot.
@williamravenelle3863
7 жыл бұрын
"But it's more powerfull thant that." What a wonderful way to end the video. Thanks for the explenation !
@behnamasid
12 жыл бұрын
This is the only video on youtube that made me understand Gaussian surface ! thank you
@fitkids3556
11 жыл бұрын
Professor Lassevirem I just want say thank you for you videos. Let me tell you how much they help me: when I am lazy I don't need to worry because I have professor lassevirem. Before my physics classe I see your video and I look smart in my professor eyes. Thank you so much for you take you time to help other , particularly Me.
@suyashrajput5814
5 жыл бұрын
Thank u so much man i am a Indian.....and my teacher teach this thing me in hindi but then also i wont get that.....and u just take 10 min to clear all my concepts
@TheTonyRichmond
11 жыл бұрын
Thanks for the video, it helped me a lot! By the way, at 7:35 you meant "parallel" instead of "perpendicular," correct?
@samdev3296
7 жыл бұрын
2017 and still using this video the excellent of this teaching never past away
@thelocotauren
12 жыл бұрын
This is definitely the best explanation i've seen on this subject. Thanks for doing this video.
@LynneLaRochelle
7 жыл бұрын
Fantastic videos! Thank you for making them. These are very helpful in my review of the physics I took 20 years ago.
@keyagemechu9292
12 жыл бұрын
Well done I learned in 10 mins from you than from my professor in 3 class periods!
@lolxox21
11 жыл бұрын
WOW THANK YOU. cant express my gratitude. You saved me at least 3 hours.
@noobshateme3554
6 жыл бұрын
thank you so much! much more helpful than my teacher at school he doesnt really know how to teach. btw, love what you are doing thanks again :)
@SimC-h
11 жыл бұрын
DUDEEEEEE your videos will make me pass my test..... THANK YOU 100000000x
@DKJHAGSL
Жыл бұрын
Outstanding explanation...this was really helpful. BTW this video was made when I was 2 year old🙂
@Thefesty87
13 жыл бұрын
You are sooooo much easier to understand than my prof. Thanks a bunch!!
@ridael-mehdawe4681
11 жыл бұрын
thats right he did show us the clear and right diagram but by mistake he said perpendicular, he had to say parallel its a great job, dA is not the change in area, dA is the smallest area we can get go to the basic definition of the derivative hope u understand the meaning of dx which is the shortest length, dy is the same meaning, so if you multiply dx by dy you will get dA :)
@TheHiddenChronicle-b9l
5 жыл бұрын
Wish my textbook explained as good as you, sir thank you for this
@emilyhazel182
4 жыл бұрын
Cant even explain how helpful this was!
@christopherarnold6576
10 жыл бұрын
Understanding Maxwell's Equations is on my bucket list (I know, I know). This explanation is what has made that possible. Thank you.
@mobasharulislam6609
4 жыл бұрын
Really love your channel. You make everything so much easy to understand.
@xxMikePortnoyJrxx
10 жыл бұрын
Sageretowns Hussam is right but a more general (and mathematical) explanation is that a 2 dimensional surface has the direction of it's normal (perpendicular) vector. That's why the equation of a plane contains the components of its normal vector, it's the plane's direction. Say you have a flat rectangle in a 3D space: a(x-x0)+b(y-y0)+c(z-z0)=0; is the vector that sticks out of the center (or anywhere really) of the rectangle at a 90 degree angle with respect to the rectangle. Picture poking a pencil straight through a piece of paper. The more general form is doing the dot product of two vectors that describe the plane: * [ - ] * =0 Where is a known vector on the plane It's sort of the same as y=mx+b where m is the slope (direction) of the line. Basically the direction of a surface is whichever way it faces. Excuse any errors or oversights.. If you've had Calc III you should know this, but if you haven't...well there ya go.
@paulrozy
11 жыл бұрын
i love how you present an argument for each line. magnifico!
@alwaysdisputin9930
3 жыл бұрын
8:30 Why does E being uniform at all points on the Gaussian surface mean you can move E outside the integral?
@prebenness
10 жыл бұрын
At about 7:30 you say E is perpendicular to dA, but as dA is a vector with direction normal to the surface wouldn't E and dA be parallel, not perpendicular? If they were perpendicular the dot product would be zero right?
@derektim7231
10 жыл бұрын
He stated that in the description. But yes, you are correct.
@270103023
10 жыл бұрын
Yeah I was confused by that too. Thanks you pointing out.
@percyjacks8170
8 жыл бұрын
Great video lassevien1 , you did a better job of explaining this than my lecturer. It would be nice to have a pdf of all the papers you write on.
@chidogg93
12 жыл бұрын
omg. how the you simplified the integral was amazing! it was simple, yet why didn't i get this in my lecture! Thanks mate!
@DrBeardAndBiceps
10 жыл бұрын
I have to agree with the others, you're very, VERY good at teaching. Great pace and clarity of voice. You teach everything in a sensible order, I really enjoy the videos. So thank you, keep them going.
@KR-cn8nq
6 жыл бұрын
Hey, first u said that E and dA were parallel to each other but then said that the dot product was removed because E and dA were perpendicular? Dont u mean parallel?? Thanks for your video
@JuanSanchez-qt1ue
6 жыл бұрын
ktvgemist I don’t understand why can you remove the dot product and make it a multiplication of two scalars because they are parallel?
@juliuspallotta6471
5 жыл бұрын
@@JuanSanchez-qt1ue because dot product is a comparison of two values. if they are parallel aka 0 degrees seperate, then when you do the dot product u*v=|u| |v|cos(theta), cos(theta) is 1, so it is just a multiplication of scalars...makes sense?
@alwaysdisputin9930
3 жыл бұрын
@@JuanSanchez-qt1ue At 7:55 E is parallel to dA hence if you take the dot product E • dA = E dA cos(0)= EdA because cos(0) = 1
@alwaysdisputin9930
3 жыл бұрын
@ K R Yes. He said in the video description "at 7:38 I incorrectly state that two vectors are perpendicular when they are obviously parallel to each other."
@thomasbennett8414
9 жыл бұрын
dA as a vector quantity is really dA(scalar) times the normal to the area which is a unit vector. so the direction comes from n which is what the E-field is actually parallel to.
@blue9549
6 жыл бұрын
E wasn't perpendicular to da they pointed in the same direction so the angle between them was 0, cos (0) =1 which is why u were left with EdA under the integral
@leviterande
10 жыл бұрын
I have an interesting thought/question Eventhough its only the conduction electron that moves to one side in a conductor, am I correct in saying that the PROTONs displacement is also changed? the reason is that the protons should be attracted closest to the higher electrons density on each side, i..e in charged solid sphere:: 1-The excess charge electrons are all at the surface. 2-the protons of the atoms closest to the surface are slightly displaced and attracted to the higher density of electrons. I am really wondering about this.. Could you please if you can help me with this? Thanks for your time reading my post. Regards Karl
@BankruptGreek
5 жыл бұрын
1:19 isn't the electric field onto a surface infinite? (if the material has a charge on the surface) since E=Q/4πer^2 , if r->0 then E->+infinity
@loki1527
10 жыл бұрын
You should be a teacher seriously .. Why every time, professor's university are making too complicated for something that are quite easy .. By the way, thanks !
@Pazalino
6 жыл бұрын
Thank. Really appreciate the effort you went through to tech the concept.
@sunsparx1
5 жыл бұрын
Dear Sir, I have query, in the initial part it is stated that E and dA are parallel on the gaussian surface and at video run time 08:04, in the definite integral you are making them perpendicular to remove the dot. Appears to be a contradiction. Kindly clarify pse. Rgds and thanks for a very well explained video.
@lasseviren1
5 жыл бұрын
You are correct. The mistake is at 8:04 when I should say they are parallel (not perpendicular).
@tiediealien
8 жыл бұрын
At 6:12 you say that E and dA are always in the same direction... what if it was a negative point charge? The electric field would point inward towards the negative charge and if dA is the vector normal to the Gaussian surface it'd still point outward meaning that E and dA would be pointing in opposite directions. Is my thinking flawed? Please help, thanks.
@varunmanavazhi5664
8 жыл бұрын
True, the electric field and dA would be directed opposite to one another at every point you consider. This means theta (angle b/w E and dA) would be 180 degrees. In this case, it was 0 degrees. The difference is you will have a negative sign since cos 180 is -1. E.dA=EdAcos180= -EdA
@satellitesage2487
6 жыл бұрын
What's the difference between closed surface integral EdA and closed surface integral E dot dA??
@neospartan3927
7 жыл бұрын
why is it necessary for the dA to be normal to the surface ?
@en9340
8 жыл бұрын
Great explanation! Just made my studying a whole lot easier! Thank you very much
@en9340
4 жыл бұрын
@Marko I believe it was Physics 2. Done with it, yes. Thanks for asking :)
@en9340
4 жыл бұрын
@Marko What are you studying?
@zuhairalsaffar7001
6 жыл бұрын
I need to thank you so much for your help God bless you and your family
@accrig1386
6 жыл бұрын
Wow followed through all the explanations best. Thank you Sir
@mistymisty4480
12 жыл бұрын
amazing video everything is so well explained and properly illustrated i feel i could understand everything you're talking about if i was in elementary school. Would be great if you could make more videos expanding a bit more into electrical and electronics and not just fields and waves. would also appreciate a lot more examples if you have the time. thank you
@mkeras
11 жыл бұрын
Why can't be professors be as good as free 10 minute youtube videos?
@azizbekurmonov6278
Жыл бұрын
Old but gold videos
@ಇLiv
5 жыл бұрын
What kind of situation is this equation applied to
@WinstonArthur
12 жыл бұрын
Very well done. This was baffling to me before I found your video. Thank you very much for your help. If you have more videos on I'm going to check them out.
@Mustache_14
4 жыл бұрын
I'm sorry but I'm still confused, the part where you removed the dot in the formula, does it make "E" and and "dA" a single entity because they have the same vector?
@lasseviren1
4 жыл бұрын
When you take the dot product of two vectors it gives you a scalar (non-vector) quantity. A (dot) B takes the magnitude of the component of vector A that is in the direction of B and multiplies it by the magnitude of B. Since E and dA are in the same direction, then E (dot) dA can be simplified into E*dA.
@Mustache_14
4 жыл бұрын
@@lasseviren1 ok now I understand thanks
@Sageretowns
11 жыл бұрын
A question, how can an area be a vector quantity? An area has magnitude but no direction.
@RathnaValluri
11 жыл бұрын
isn't E supposed to be parallel to dA at 7:35 according to 6:35 ? if they are parallel then the angle between them is 0 and their dot product E.dAcos(0) = E.dA because cos0 is 1.
@angelsown911
11 жыл бұрын
I can tell that you would make a good dentist.
@DeathrashWhiplash
11 жыл бұрын
Could someone help me? I don't understand why the E and dA have vector arrows?
@JackSmith-bb1fc
10 жыл бұрын
what do you mean by a closed surface
@EagleLogic
7 жыл бұрын
So badass at the end you just derived the electric field
@rafeenaqvi1005
10 жыл бұрын
damn im so scared right now we havent started to learn this im class yet but when we do i know im going to get lost
@ClumpypooCP
5 жыл бұрын
Rafee Naqvi hey rafee, now thats its 4 years later, did you get lost?
@dantej7330
5 жыл бұрын
@@ClumpypooCP He's not responding, he must be lost
@aatsista
4 жыл бұрын
OMG ME TOO!!
@TheBull06
14 жыл бұрын
omg thank you for explaining the symbols! I never knew what they meant!
@drnour5247
3 жыл бұрын
Teacher! in 7:54, Don't you mean that because E is " Parallel " to dA so therefore we can get rid of the dot product? Because They are not perpendicular to each other and also if they are so, so cos 90 is equal to zero which cancels out all of the dot product. Please I need your feedback! Many Thanks for your fathomable explanation !!
@lasseviren1
3 жыл бұрын
Yes, you are correct. The video had an annotated bubble that use to appear to let the watcher know about this mistake but KZitem discontinued these very useful annotations. So now the mistake is noted in the video's description. But you are absolutely correct. Thank you!
@drnour5247
3 жыл бұрын
@@lasseviren1 Many thanks my dear teacher !
@psychotropix2485
9 жыл бұрын
you are amazing, a clear and concise explanation, much love :)
@MohammadKhan-ls9qw
5 жыл бұрын
Should it not be parallel instead of perpendicular?
@SqweezyC
5 жыл бұрын
These are great videos! Thanks for taking the time to make them!
@mck8627
11 жыл бұрын
Actually we get rid of the dot product, because the angle between dA and E is zero. Hense cosine of zero gives 1. The dot product is the multiplication of the absolute values of the two vectors times the cosine of the angle between these two vectors.
@31415926549530421828
12 жыл бұрын
what year college class is this? Im taking AP physics C E+M and I have to do this for the next unit
@BossX2243
7 жыл бұрын
Is dA the derivative of area?
@fatiniiteichi6060
12 жыл бұрын
i luv the way u teach.....very ez to understand...thanx so much
@MaxiimusPrime
12 жыл бұрын
At 7:38 when you say E is perpendicular to dA, shouldn't it be E is parallel to dA?
@rodolfoayala299
9 жыл бұрын
What does K (The one that you use at the very end of the video) means?
@MichaelGedies
9 жыл бұрын
Rodolfo Ayala k is just a constant, that contains all those variables he circled. The value equals about 9.0*10^9 N*m^2/C^2 This is just a simple way of writing the equation. Since the constants in the expression he circled will always work out to this number he just puts k.
@ZacharyGalifianakis
11 жыл бұрын
is dA just the change in area or ?
@ThatThing1675
6 жыл бұрын
Does anyone know what does the d in dA stand for?
@TeeDotOwe
9 жыл бұрын
You are the Man! Makes so much sense now. Thank you!!
@tiediealien
8 жыл бұрын
At around 8:00 you change E dot dA to EdA because the electric field is parallel to dA... is it true that the dot product in reality would result in EdAcos(theta) and since there is 0 degree separation between dA and E it makes theta = 0 making cos(0)=1 proving that E dot dA only equals EdA?
@gutmaggots8716
8 жыл бұрын
I'm sure he meant to say E is parallel to dA because I thought the same thing but he made a mistake
@aafroz.sadia22
8 жыл бұрын
+tiediealien yes.... since E is parallel to dA , their dot product will be Eda....as the value of cos[theta]=1
@aafroz.sadia22
8 жыл бұрын
and yes he meant parallel not perpendicular....that is for cross product with sine theta.....he meant dot product with cosine theta where cos(0)= 1......
@tiediealien
8 жыл бұрын
Does a Gaussian surface always have to be spherical?
@dhidhi1000
8 жыл бұрын
it can have any form you want.
@domoniquemarie8523
7 жыл бұрын
it's the most practical
@davidhoopsfan
7 жыл бұрын
you generally want it to be spherical
@nihatcnaroglu6558
7 жыл бұрын
tiediealien If you have a sphere = sphere rod = cylinder
@nihatcnaroglu6558
7 жыл бұрын
point particle = sphere
@pedropepe90908
7 жыл бұрын
way better than my prof or TA trying to explain it
@bravekingsolomon
13 жыл бұрын
Very clear. Thank you! & thanks for correcting the mistake to "parallel"
@siggysandwich
12 жыл бұрын
where did the vectors go?
@michaela810
10 жыл бұрын
Y'all should watch this double speed.
@ThePieMan305
9 жыл бұрын
I mostly have trouble finding the charge enclosee. cause it involves weird variables like lambda and sigma multiplied by A for area. it's never as simple as writing Q it seems :(
@chandreshyadav7198
7 жыл бұрын
See 2017
@brady157
7 жыл бұрын
These lessons are amazing
@varrunpillai2118
7 жыл бұрын
U wrote E is perpendicular to dA but it is actually parallel right?
@lasseviren1
7 жыл бұрын
You are correct.
@jscant100
12 жыл бұрын
The only thing I didn't like about this video is when you said E is perpendicular to dA you were right. E is actually parallel to the normal vector of dA. Yet the way you worked the problem was correct and helpful
@bassemragheb298
12 жыл бұрын
what is the dA means?
@RonKei2601
11 жыл бұрын
It shd be parallel, right?
@volkaman
11 жыл бұрын
Thanks for the explanation, though I think you made a mistake at the end.. If you assume E and dA and perpendicular to eachother, then the vector product would be equal to E . dA . cos90 = 0 I think you meant to say parallel, then E . dA .cos 0 would be = E . dA Thank for the video though!
@62kushaldmc
8 жыл бұрын
I am very new in this topic, but at 6:40, you told E and dA are parallel but after a while you told they are perpendicular, if they are perpendicular the dot product must be zero...:(
@Mohamed12102
8 жыл бұрын
+Raquib Ehsan there is annotation at 7:44 that E is parallel to dA
@aar3646
8 жыл бұрын
+Mohamed12102 so which one is it....sorry i still dont get it ...what the diagram explains on the video said parallel...then perpendicular... still confused
@samesam15
7 жыл бұрын
Raquib Ehsan he means dA is perpendicular on the plane (paper sheet) that he drew it on
@Mieraz22
11 жыл бұрын
i'm confused. why dont we just use E=kq/r^2 to find the field again?? @__@
@matador699
11 жыл бұрын
me at 9:48 - " oh ma gaaaawd, its a kind of magic"
Пікірлер: 350