Physics 35 Coulomb's Law (1 of 8)

[@noblessv925]

I just found out that you have calculus lectures on your website. I'm going to cry. Who needs Khan academy when we have Michel Van Biezen!

[@ElkePoN]

lol true

[@mjcorcoran84]

PatrickJMT saved my ass in Calc 3!

[@livlacerna4394]

yeah.. I wished, I found him earlier.. Although I already passed my calculus 1 and 2, I might have better grades on both courses.

[@Medwdi]

Professor Leonard is the best by far

[@InfinityLRDL]

melody emmanouilidi profesor Leonard is great at calculus 3 PatrickJMT is great at calculus 1,2, & 3. The Khan academy is not that great

[@Team_with_Deepak]

I watch your videos in 2024

[@MichelvanBiezen]

Physics doesn't age. 🙂

[@25_26]

This is far better than a so called "professor'" 's lectures at istanbul technical university which is located at middle-east swamp turkey. Thank you Sir. I passed Physics 2 class with grade A by your help.

[@MichelvanBiezen]

Congratulations! Thank you for sharing.

[@erenarslan8186]

I'm going through the same way. Pretty sad

[@xiu8548]

Michel's channel is one of the key things for my academic success. You are far more better than my professors. Thanks a lot!!!!!!

[@vinKroos8]

I am an advanced level student from sri lanka and this is really helpful. if you ever thought of making fortune just come to sri lanka and start doing tuition classes

[@MichelvanBiezen]

Glad you find our videos helpful. (Thank you fot the tip).

[@meren6223]

sir Michel I am so unhappy because I found you just now. I wish I had found you before. You are the best.

[@MichelvanBiezen]

Glad you found us.

[@pyroclastic8924]

i'm so glad i found you. now i actually have a shot at passing physics 2

[@valeriereid2337]

Thank you so very much. These videos were instrumental to me getting an A+ in physics last semester.

[@MichelvanBiezen]

Wow! Congratulations. Keep up the good work! 🙂

[@charupriya7165]

Thank you so much sir.... I have no words.... Just learnt the things which i didn't learn in 7 months with that so called teacher .... U changed my lifee .. and I'm forever grateful to u... God bless!

[@MichelvanBiezen]

Thank you for your comment. We are glad we were able to help you.

[@MichelvanBiezen]

Daniel, That is an interesting question and the answer is very complicated. It turns out that matter sometimes has a charge property. There appear to be 2 of those, with one opposite to the other. We therefore called them positive and negative. We found out through experiment, when they are alike, they repel, and when they are opposite they attract. But explaining what it is, is very difficult.

[@Peter_1986]

Sir, is this the very first video concerning Electricity, Magnetism, Electric Fields and similar content? I am having some problems understanding topics like Polarization and the Phasor Diagram, so it would be great to know if I could start with this video without needing any specific prior knowledge about electricity and magnetism in general.

[@RalphieDDD]

I agree!

[@zakirhussain-js9ku]

It seems destructive interference reduces flux density b/w opp. charges & higher density on opposite sides pushes the charges towards each other.

[@MichelvanBiezen]

When 2 electric field are directed in opposite directions, they will indeed experience destructive interference.

[@mazinnasralla2036]

Two approaches to calculating Direction of the Force: 1) Work out Magnitude and then work out the sign and direction afterwards as is done in these examples or 2) Do it one step by using the Vector form of the equation which is quicker, but you must remember that the Force on Charge X due to Y is multiplied by displacement Vector YX. That way the signs work out

[@johncartwright4041]

Michel is there anything you don't know! I'm a retired Chemistry/ Mathematics teacher and enjoy watching your videos.

[@MichelvanBiezen]

Wow, thank you! (There are actually many things I don't know, but it is great to hear from a colleague)

[@EjMacarus]

Thank you so much for the videos! Sadly I have a terrible professor, but finding these videos re-sparked my hopes to learn. My best to you!

[@ghadahalharbi3915]

you are my life savor, the best physics prof I have ever seen please keep it up we need you

[@fernandodominguez1]

More than 4000 high quality videos!!!. As prolific as Euler. Probably Guinness Record. Congratulations and thank you

[@alejandrodavidrodriguez7038]

Thank you, super clear and straight to the point. It's awesome you provide free resources for these courses online!

[@Tuanski]

He is a ninja 4:35

[@CaptainCalculus]

Renzo Tuano the Flash!

[@Cottarino]

If a conductor is charged by induction, but then it is grounded. What happens to the charge of the conductor. Because the net charge of a conductor is neutral when charged by induction right?

[@MichelvanBiezen]

In order for an object to be charged by induction, it must be connected to a conducting path, otherwise it cannot acquire the charges by induction. Once there is an excess charge and you remove the source that caused the charging by induction and you remove the conducting path, the charge will remain. If you then connect the object to a ground, the excess charge will conduct to the ground and the object will no longer be charged.

[@chemiflask7692]

1 M subscribers! congrats! well deserved, this is one of my fav academic channels on youtube.

[@MichelvanBiezen]

Thank you.

[@cyusaarnold3544]

Thanks for ur detailed explanations. I think this channel can help many physics or engineering student to understand and even pass their exams.. It s been really helpful. Thanks😄

[@ahmed99094]

my left ear will have fun. :D

[@ineedcoffee7949]

+Ahmed Ali LOL this whole time I was thinking my headphones blew out until I read this comment haha

[@Peter_1986]

I just put my headphones on the table and turn on max volume - loud enough to be audible, and fun for both of my ears! :D

[@tarikcetinkaya4702]

can we change volume options for headphones ?

[@ajnustian1086]

Thanks sir....because of You ...my EMT paper went good

[@saurabhmaurya3177]

You are a best teacher, sir

[@ioX7y3JHlCdtAiE]

Sir, you're truly astounding.

[@MichelvanBiezen]

Far from it, but glad we are able to help students from around the world. (My wife puts in an enormous amount of work filming, editing, producing, and uploading all these videos while making all the amazing thumbnails.

[@rhuthk2710]

I watch your videos on your website so i cant really have a chance to say thank you over there. But thanks a lot for all of your videos. They are life savers indeed. Please never stop teaching sir.

[@MichelvanBiezen]

We are glad you are finding the website helpful

[@FcBarcelonaKid]

Better than my shitty professors

[@warrenwillingham6597]

I guess this is an intermittent problem, but only the left audio channel is working for a few videos. To entirely prevent this, you can set your audio to MONO in your settings when you are creating the video.

[@MichelvanBiezen]

+Warren Willingham We had audio problems with our old videos. We have since figured out how to correct these problems. Thanks for letting us know.

[@deepumishra3714]

Michel van Biezen you are great sir glad to know u thank u so much

[@mansisikarwar53]

The best ever explanation. I m from India and I really loved it.

[@MichelvanBiezen]

Welcome to the channel!

[@roccom.3924]

I am taking E&M junior level in college next semester. Is this the playlist where I start? Thank you!!

[@MichelvanBiezen]

These playlists starting with this one will give you a great overview for your upcoming class. The problems in the class that you will be taking will be more difficult, but getting a good handle on all the major concepts here will help you a lot and there is a fair amount of overlap.

[@nehirkaramese]

Thank you for simplifying this 😭 I was about to regret choosing engineering...

[@MichelvanBiezen]

Glad we were able to help. Don't give up and keep it going.

[@ElkePoN]

Do more videos on physics 2 please! You explain extremely good! My teacher goes like 100 mph it's impossible to retain anything, please

[@sadoliver5994]

Thank you so much for this! Beats reading the book and understanding how to do the problems by yourself! :)

[@shamssaied4801]

I have a question, I was looking for a good resource to study electricity and magnetism from and stumbled upon this playlist. Now the question is: is this playlist calculus based or can I get through it without any knowledge of calculus?

[@MichelvanBiezen]

You don't need calculus for this playlist (for most of the videos). For some you may need calculus, but you can skip those.

[@magicrectangleEnt]

dude you're a hero...

[@benchang8905]

thank you very much because you save me from failing physics!

[@vedantsinghal5637]

sir you should add some practice worksheets on your ilecture website it will really make us believe in our self that we understood the topic and if we didn't you are always there sir to help us understand it. hope you will like my idea.

[@MichelvanBiezen]

It is a very good idea. We currently don't have the time, but in the future this may become possible.

[@lecudig92]

Very helpfull, you helpme pass Mechanics, now Im in physII ( Electric&Magnetism)

[@Nshiime]

you have literally saved my life

[@MrBarzilai2k]

Greeting from Israel! Thanks a lot . Extremely instructive.

[@MichelvanBiezen]

Welcome to the channel

[@WanSyazlina]

I have several questions... i just want to deeply understand the concept first. hehe 1)If there is only one charge, Will there still be an electric force. Or does electric force only exist between two charges? 2) if there is no electric field, then there is no electric force? 3) Why must a test charge be put into the magnetic field, what if it wasn't a test charge put into the electric field, would it still move within the electric field? 4) What do these charges actually look like in real life? Like where are they located. Is everything made out of charges?

[@tomdarnell5905]

Do you still want the answer... I will answer if ya want.

[@evinwilliam]

You really helped me tomorrow for my exam ... Really usefull .. Thank you so much

[@katiegrav6983]

The best video that I've seen so far explaining this topic... Thank you so so so so so much!!!!!!

[@ryanleyland5565]

Thank you so much for sharing amazing knowledge. This Electricity & Magnetism playlist has helped me greatly. Differential calculus next semester, so I know where to look. Thanks again Michel, Ryan

[@MichelvanBiezen]

You are welcome and thanks for sharing.

[@thegdt37]

In the movie Limitless, there is a quote "I suddenly know everything about everything" after the main character takes the pill. You indeed know everything about everything...

[@MichelvanBiezen]

Far from it, but I try to learn something new every day. :)

[@austin.eikermann]

This guy is the 🐐

[@Chan-ux7ej]

Hello Michael van Biezen, I noticed that you have quite a few playlists for physics E&M, and I was wondering in what way they varied from one another. I am taking physics 2 my following semester in uni, and I was wondering if just using one of your playlists would suffice, or if every playlist are viable for studying/learning the material.

[@MichelvanBiezen]

If you are taking the second semester of a 2-semester physics series than playlists Physics 34 through Physics 65 are applicable to your studies next semester.

[@Truth_Seeker567]

Thank you so much Michel for you kind help by making and sharing this clear and fantastic video.

[@MichelvanBiezen]

You are very welcome. Glad it was helpful. 🙂

[@isaacaltice1836]

your videos are a huge help, thank you

[@hcam93]

Could you make a video for the following problem: A uniformly charged Q/C rod of length L and total S charge Q lies along the x axis as shown in Figure P23.42. (a) Find the com- ponents of the electric field at the point P on the y axis a distance d from the origin. The image shows a point P which is on the end of the rod where x = 0.

[@MichelvanBiezen]

I believe we already have a similar problem in the playlist.

[@MichelvanBiezen]

Here is a similar problem. (but with the electric field)

[@mikeg6854]

Can we say that the suppost minus (-) in the Force final expression relates to the atraction of the charges?

[@MichelvanBiezen]

I would not rely on a "negative" sign to determine the direction, but determine the direction of force for each pair of charges.

[@TheDespicableD]

Michel, your videos helped me succeed in Mechanics. Now, I'm taking E&M and I'm pretty sure that that these supplementary exercises will me understand the new concepts this semester! Thanks and happy new year!

[@MichelvanBiezen]

Good job! All the best in your E&M studies

[@ksoni524]

Are you in John abbot? or any other cegep in QC?

[@MichelvanBiezen]

Kabir Soni Kabir, No, I am doing this independently.

[@nunezmanuelivandasaev1172]

you helped me a lot! Thank you!

[@MichelvanBiezen]

Glad I could help!

[@chethans5908]

sir, please upload basics of electricity and magnetism

[@MichelvanBiezen]

There are hundreds of videos on E&M You can find them from the home page.

[@parthpatel6498]

super bro !! Now I will Pass in my Viva Exam !! tnx.

[@EISSA7495]

You helped me a lot understanding physics 2

[@ragd460]

Great explanation.thank you so much

[@woghd4390]

thanks for the simple teaching of u

[@童乙]

You're so patient and helpful!

[@4pharaoh]

Love your work, very easy to listen to. Thank you. But I have a question. I have read that the absolute |magnitude| of K is EXACTLY 8987551787. 3681764 Nm^2/C^2 which is EXACTLY |c^2|/10,000,000 [299292458 m/s]E2 =89875517873681764. It cannot be a coincidence that every significant digit is the same (a billion- billion to one odds]. I have yet to find anywhere that describes this coincidence, any insight? Anyone? anyone?

[@MichelvanBiezen]

There is definitely a connection. Maxwell discovered that c = 1 / sqrt( epsilon x mu) = 1 / sqrt (permittivity of free space x permeability of free space)

[@bikinibodydanceJA]

Great Videos!! simple+straight to the point

[@ayushhongkong]

the charge was given as 6, where did the x10^-6 come from?

[@MichelvanBiezen]

The charge was given in microcoulombs

[@zakidev]

hallo sir, please make a video about conservation of charge

[@animeshtalapatra9558]

Hello, sir your videos are very helpful. I have a problem in this chapter....we know that the value of epsilon0 is 1 in CGS,then how we conclude that K=1 ?

[@MichelvanBiezen]

no, the value of epsilon 0 is not 1 (in cgs units). It is 8.85 x 10^-12 in mks units

[@animeshtalapatra9558]

+Michel van Biezen you cleared up the matter...I mistook it .Thank you very much.

[@lizethvargas6577]

Build a distribution of point loads along the That far from them their electric field along the axis varies by 1 / r6. Electromagnetic physics, please help me with this question, thank you

[@radimollov4562]

Professor, I am right in the beginning of my "Electricity and Magnetism" journey, so I was wondering if You are able to link a video in order for me to start from somewhere so I can understand everything important. Thanks in advance.

[@MichelvanBiezen]

Since you wrote the comment on chapter 35 "Coulomb's law" you are at the right place. We have several dozen playlists on E&M and they cover the topic in the order it is recommended. Have you found the organization of the playlists using the home page?

[@radimollov4562]

@@MichelvanBiezen Well, I first searched up on your website where all the lessons are organized but I really thought that I would be missing something. That's the main reason why I asked You to send some link in order for me to take the right lessons in the right order :).

[@MichelvanBiezen]

Starting on chapter 35 is the correct place. Physics 35 Coulomb's Law (1 of 8) kzbin.info/www/bejne/Y5vbiWqMqZeqqKM

[@fertilizin7935]

you're a life saver

[@nataliapaz]

Thank you, I really like your videos...way better than my teachers. Why don't you accept subtitle contributors? I would love to add spanish subtitles so I could share your videos with my classmates.

[@TheLychie]

When plugging in for F1, where did (6.0x10^-6) come from? Particularly the part where it says x10^-6

[@MichelvanBiezen]

TheLychie The charges are in micro coulombs (the Greek letter mu means micro = 10^ -6)

[@Hunter13166]

Hello, may I ask a question? Does F2 = -0.054N = 0.054N at 180 degrees? or is there still a negative there?

[@MichelvanBiezen]

The sign, be it positive or negative, ONLY is there for the direction of the force and has no further meaning. FIrst we calculate the magnitude of the force (ignoring signs) and then we add the sign to depict the direction of the force. Therefore, the force on the negative charge will be to the left (add negative) and the force on the positive charge will be to the right (add positive). (The magnitude will be the same for both)

[@salmanturkiyede7557]

Hello teacher, could you tell me why ^-6 in both 6.0 and 4.0?

[@MichelvanBiezen]

6 micro coulombs = (6/1,000,000) coulombs = 6 x 10^-6 C

[@salmanturkiyede7557]

@@MichelvanBiezen which means constant

[@rsdummyacc3129]

my right ear feels sad

[@MichelvanBiezen]

Yes, the old videos were not recorded in stereo. (We corrected that with the newer videos). We had a lot to learn about KZbin.

[@sizzlinsj8135]

I interchanged my headphones every minute

[@alexeycherepanov7943]

@@MichelvanBiezen What Charles Coulomb actually did - drive.google.com/file/d/1rAkRKb9lvAfyQdRz8mMNii9iSXAwlzN2/view?usp=sharing What Charles Coulomb actually did - cloud.mail.ru/public/3t7j/3v4Aj5Tqc

[@WonderWorldChronicles92]

hello can I use your video for my online class as a reference.

[@MichelvanBiezen]

Certainly. (as long as source is indicated).

[@WonderWorldChronicles92]

@@MichelvanBiezen thanks a lot I actually love your lessons.

[@MichelvanBiezen]

Thank you for using them. (Glad you like them).

[@tongchutee157]

do you hv any videos on explaining the flow of current in a transistor or diode? thank you so much

[@MichelvanBiezen]

+tong chu tee Not yet. I am starting a video series on electrical engineering, and those topics will be part of it.

[@tongchutee157]

Michel van Biezen oo okay hope to be able to watch it soon~

[@shawnmuench]

Alright I think I've confirmed that picking IT as a second career was a better fit for me. This is so anal and you're doing an amazing job! Thanks for the vids. (I know 'thanks' doesn't mean much.)

[@MichelvanBiezen]

In today's world IT is an excellent career to get into. We just can't find enough people with that skill set. All the best. (Your "thank you" is very much appreciated).

[@shawnmuench]

@@MichelvanBiezen Wonderful encouragement!

[@shivgujjar4030]

thank you very much sir

[@anum6391]

Thank you very much 👏🏻👏🏻

[@laithoonjo5599]

Thank you dude knowledge for all the world ? i Wonder whats name of this Book Physics 2 Please/

[@Peter_1986]

+LaithooN JO I am not sure what book he is using for these videos, but some of his problems have looked very similar to problems in the book "University Physics With Modern Physics". I can actually highly recommend that book, it's great and has a very relaxed and reader-friendly style, and the chapters are in a very intuitive order. Try and get your hands on the 13:th or 14:th edition if at all possible.

[@laithoonjo5599]

Owh well! Thank you Man!

[@olumcul4970]

i might be late but should i watch explained series too to udnerstand dis

[@MichelvanBiezen]

I recommend that you watch several videos of this playlist, it will reinforce your understanding.

[@MikkoHaavisto1]

very nicx lessons, thanks!

[@suzu_mio3563]

4:30 I really thought he would say "now that I realized that I forgot my calculator, I'M GOING TO ANSWER IT MANUALLY" hahahaha that would be sick xD anyways great videos I learned a lot hahaha

[@ntwohiu0252]

After you getting the calculator, your voices sounds very exhausted

[@chibingwei761]

sir,the permittivity of free space not 8.85*10∧-12？

[@MichelvanBiezen]

With the proper units, yes.

[@MichelvanBiezen]

k = 1/(4)(pi)(permittivity)

[@sanasafi6302]

from where u get the answer i didnt get itttt plzzz explain

[@MichelvanBiezen]

sana safi What answer did you get? Let me know what you did and I can try and see where you may have gone wrong.

[@nadhrahzulkifli8238]

sir , i don't know but starting from this video until physics - gauss law 3 of 11 spherical charge . (the sound) doesn't come out when i plugged in my earphone.But in other videos in utube , my earphone is working fine and i can hear the sound ...is there anything problem and is there any other way so that i can hear ur voice because the subtitle given is a bit weird for me . :)

[@MichelvanBiezen]

+Nadhrah Zulkifli We had some problems with the sound on our earlier videos as we were learning how to put videos on KZbin. We have solved our problems on the new videos.

[@ajathreya5005]

Sir how can we address force between two charges when separation r=0 ?? really is it infinity ??

[@MichelvanBiezen]

We can never have zero distance between two charges since they take up space.

[@ajathreya5005]

thank you sir.

[@1fenash]

Hi, since the second charge is negative why its on the right side of the x axes?

[@MichelvanBiezen]

fenash1, The units for the x-axis and y-axis are m (meters). They represent position. The charge (negative or positive) is independent of their position and thus a negative charge can be located on the positive side of the x-axis and a positive charge can be located on the negative side of the x-axis.

[@1fenash]

So, are you saying we can locate them randomly as long as we keep track of the charge sign?

[@MichelvanBiezen]

fenash1 Charges can be placed anywhere with NO restrictions.

[@mrbriansu]

the law of action and reaction 😀

[@MichelvanBiezen]

Yes, that is correct.

[@Psikolirik]

the value K in my college is 8.99x10^9.... should I follow them.

[@MichelvanBiezen]

It really doesn't matter. 8.99 is correct to 3 significant figures.

[@ianloveservice]

Proffesor. Do I need to study also Physics in electrical engineering or its okay to pass on it.

[@MichelvanBiezen]

A strong background in physics will be VERY helpful.

[@787310]

i love you so much dude no homo

[@lia1349]

Richard Gluten

[@sizwembokazi8725]

Always interesting!!!

[@astigtodamax]

Why Coulomb's constant denoted by K?

[@MichelvanBiezen]

Paul, You can also use k = 1/(4 * pi* epsilon)

[@bios546]

Q1 and Q2 are scalars... R^2 becomes a scalar, so is k a vector?

[@MichelvanBiezen]

ess kp No,k is just a constant. Notice that a vector has magnitude and direction So the force has a magnitude and acts in a certain direction. The definition of the electric field: E(vector) = F(vector) experienced by a test charge divided by the magnitude of that test charge.

[@bios546]

Michel van Biezen u-huh... true true. So, over all the expression of F(sub)e will be a vector... acting in the direction of the unit vector joining the two particles under consideration... right?

[@MichelvanBiezen]

ess kp The direction depends on whether or not the particles repel each other or attract each other.

[@bios546]

Michel van Biezen Ok I understand. But, I heard that k = 9e9 Nm^2/C^2 only holds good in a vacuum. So, here is a new question... How does it depend on the medium, I know about k=1/(4*pi*(epsilon))... but, what kind of medium makes the electrostatic force high and vice-versa?

[@MichelvanBiezen]

ess kp k is the largest in a vacuum (free space) k is smaller in all other substances

[@abdulahad200]

Ur notation is off, u should use q instead of Q, Q is already used for heat energy

[@MichelvanBiezen]

In physics we often reuse the same letter for multiple variables.

[@emresarac2100]

My left ear's been educated so well lol

[@MichelvanBiezen]

Yes, our older videos were recorded in mono sound, before we figured out what we were doing.

[@emresarac2100]

@@MichelvanBiezen That's not a problem, still one of the best videos

[@muhammadusmantv3147]

thank you sir

[@jaimegonzalez7714]

Why do the numbers have ×10^-6

[@MichelvanBiezen]

The charges are expressed in micro coulombs.

[@shrirangsapate]

what is the force exerted by infinitely long wire on a test charge?

[@MichelvanBiezen]

That is a good question. The approach will be the same as finding the electric field due to an infinite long wire of charge. (We'll have to make a video on that).

[@shrirangsapate]

Michel van Biezen Ok I got that but can this electric field can be written in terms of charge instead of charge density?

[@shrirangsapate]

Can we talk on mail, I'll email you the exact question for which I'm looking

[@shrirangsapate]

My mail id is [e-mail]

[@heartdoc922]

why am I finding this a day before my test! =(