Physics 12.2.1b - Coulomb`s Law - Simple Examples

[BluePhire1]

If 1 Coulomb is such a large amount of charge why didn't they change the measurements of charges to fit smaller charges and then change the constant k as well? Seems like its always a waste to write out nano coulombs and then k just to have the 10^-9 and 10^9 cancel.

[mohamedamjadakram]

People like you are the reason for many bright students! Thank you very much for all your efforts in producing these videos.

[Waqasgju]

May i say I LOVE YOU

[Panicatthebusstop]

oops, i didnt watch the whole video :)

[Panicatthebusstop]

Since 1 coulomb is 1000 times larger than a millicoulomb, then would the equation 9x10^13(mc)(mc) over r^2 be ok? *I dont know the millicoulomb sign.

[mwanga1000]

how cn u dislike dis itts great thnks

[HellasRocks4Evar]

thank you Mr. Owens!

[FlyingPorpoise]

Thank you Mr. Owens.

[adisamun]

brilliant!



[shadowC10ne]

What software are you using for your videos (to write, etc.)?

[x0xbethaNyyx0x]

this may sound REALLY stupid, but at 1:04, where did you get the 9 from?

[derekowens]

@x0xbethaNyyx0x That's the electrostatic constant. It's one of the constants of nature. It simply shows up in Coulomb's Law. The size of the number tells us something about the strength of the electrostatic force.

[1sushicheese1]

@derekowens is there a way to like prove it all I get is that its some magical number we plug in I get why the gravitational force is 9.8m per second squared but this is just confusing me ....

[033455124]

@x0xbethaNyyx0x that is the value of "k"

[crystalidx]

Please continue your tutorials, they help alot.

[g7thsus]

just one question:

whats is 1/[4(Pi)(epsilon)]

the epsilon is with a subscript 0

[NikolaidisJohn]

Before i saw that video i was very baffled

Thanks

[Letspreach]

Did someone mention the word "simple"?

[moneefiction]

i wish you were my physics teacher...all my teacher does is print out someone else's notes from the internet and gives them to us barely explaining whats going on. Thank God for people like you sir. Bless you :)

[ILUVCHOCOL8MOR]

Brain fart= FIXED!

[19jom19]

what's going to happen if we have to find the F between three Qs ? we are going to find the Fa between Qa and Qb and then we'll find the Fb between Qb and Qc ... RIGHT? ok if this is right what are we going to do next to find the total Force ?

Are we going to do Fa + Fb ??

whoever knows the answer , answer please the soonest possible !

Thank You a lot . :)

[derekowens]

@19jom19 That's right, If there are are three charges, then the force on charge A will be the sum of the force exerted by charge B and the force exerted by charge C. These forces have to be combined as vectors. This is actually a fairly standard electrostatics problem, although it's really more of a vector math problem. Good problem, though.

[19jom19]

@derekowens Thank You for answering my question. I have to say that all of your videos are really helpful too.

[oforak47]

@derekowens sir can i use 1/4^eo rather than using k

[MSuzetteReyes]

@derekowens I wish you can show us an example of that :)

[muntas1]

keep up the awesomeness

[catorxzhe]

thanks.

[eGamerVince]

so how it became 60 N, since in my calculations the result is 0.6046875 and there was no more scientific numbers given..??

[Adaeze611]

Will the 60 N be negative since the force will draw the particles to each other? Or is force always positive? 

[eGamerVince]

@Adaeze611 60 N is positive

[Ultimaxkeyblade]

you and patrickjmt are thebomb

[lovehpkat]

Thankyou so much, this has been an amazing help, I now know what I'm doing for my test tommorow, thanks once again.

[MFLOVEify]

thx u very much, u are awesome!

[unicornguard]

Thank you so much. My current physics teacher is kind of terrible, but I actually understand it when you teach it. Thanks!

[Henrickunit]

So what exactly is one coulomb?

[derekowens]

@Henrickunit A Coulomb is a certain amount of charge. Just as a meter is a certain amount of length, and a second is a certain amount of time, a Coulomb is a certain amount of charge. Charge is measured in Coulombs.

[Henrickunit]

@derekowens I just don't understand why they use 96500 coulombs = charge of 1 mole of electrons. It seems like they could of used a smaller constant for charge. I don't understand why they didn't just make one coulomb equal to the charge of 1 mole of electrons or just one electron. I heard that it's convenient number when dealing with magnetism..

[frankiedetorie]

@derekowens it is an SI unit so it cannot be reduced?

[GutterColin]

I kept forgetting the x10^6 on my charges.Thanks! Now I'll pass my test tomorrow.

[mangral26]

solve this pls what must be the distance between point charge q1 = 26.0 uc and point charge q2 = -47.0 uc for the electrostatic force between them to have a magnitude of 5.70 n . please send me please

[kako13pr]

Hi,

Do you have any video that explain how you can get the direction?

Ex. F1 = 45 N @ 180 degrees.

Great videos.

Thanks!

[everpasaway]

i agree with everyone!

you are so awesome. thanks a bunch for the help. ;) keep on keeping on

[damonH24]

Awesome, ty!

[HQuinn22]

wow, THANK YOU!

[hyphysimon]

THANK YOU so much. I learn more from your 7 minutes videos than my teachers 55 minutes lecture. Thanks again for helping students like me. we appreciate your help.

[akashbatash]

Excellent lecture!!

[LouisMun]

I LEARNZ MATH

[zelunika]

thankyou sir

[maumauktt]

Thank you!

-> From Brazil

[tnagan]

You have a gift. Thank you for sharing it with us! Many students turn to Youtube when their teachers aren't very good at teaching. You are doing us such a huge favor by giving us an alternate teacher!

[Kevr0]

Amazing! Your explanation helped me so much! Thx from ASU

[mrashi01]

Derek Owens, you are the man. Because of your lectures, I now know COULOMB's Law.

Something I've noticed is that, because teachers don't want to level up with some of the students(in explaining wise) , students sit in the class like a rocks. what I am trying to say is that you explain well and I am grateful for that.