How to calculate the force between THREE charges

You've been asked to calculate the force on a charge. Easy right? Just use Coulomb's law. BUT WAIT! There are THREE charges! Ahh! This video walks you through every detail of how to go about solving this problem so you can ace that exam question.

Watch the next video here!

1) The worked example question is: In the diagram (shown in the video), charges q1 = q2 = q3 = 2.3 x 10^-9 C. What is the size of the electrostatic force experienced by charge q1?

[marcogavinol]

Baby steps.. so sweet, and perfect for my baby brain😊
Thanks for your job!
It"s perfectly understandable, even for foreigners like me (watching from france).
I wish you"ll keep making these physic tutorials!

[sonikgain]

Why is this channel doesn't have 1 million subscribers at least ??
great work thanks for all this effort really helped me :)

[Juarqua]

Maybe I'm a little nitpicky but of course it has to be N² under the square root because otherwise the units won't fit. - And I have to point out that in all the other three videos all the other units in this four videos playlist were right! By the way ... The Coulomb constant must have such a weird unit because that's the only way that the result comes out as a regular force measured in Newtons ;-)

[janistransbian]

you're helping us learn. this is better than television.

[jannegrey]

Q3 is half the distance to Q1, than Q2 is. So shouldn't the F13 be exactly 4*F12? Those were probably approximations (F12 being little less than 1.2 x10 ^-4, to the extent that approximating to the one decimal place makes it look like it isn't 1 to 4 relation, based on distance 1 to 2), but this is a case where inverse square law 1/r^2 is really useful. Double the distance, you have 4 (2^2) times weaker Force. Triple it, You have 9 (3^2) times weaker force. So if forces are orthogonal in this case (and they are) horizontal force is 1/4 of the vertical force. Although whether forces are orthogonal or not, doesn't make a difference. If for example we take numberline and put Q1 on 0 spot, Q3 on the 1 spot, and Q2 on the 2 spot, than Q2 would generate 1/4 of the force on Q1 than Q3 (F12 = F13/4) Total force on Q1 would be FTotal = F13/4 + F13 = 5/4*F13.

Still a very nice video and it helps understanding Coulomb's Law to the beginners :) Keep it up!

[AlexandrBorschchev]

Im curious, how do you make videos like this? Do you read script/talk live/use slides?

[mapeallan.w]

Thank for the explanation...you saved me for my 3 day physics assignment 👑

[mdrumel]

Mam, if +2q, +q, +q these three charges are placed on the vertices of a equilateral triangle, where the net electric field will be zero?Pls help.

[alliyaawi]

Thank you so muuuch! You explained what my teacher can't.

[salkabalani]

It feels that the answer is incomplete. In your calculations you completely ignore the repelling force between q2 and q3. I think we will need to take that into consideration when we do our final vector calculations. What was the reason you left it out?

[SanikKawena]

Thanks it's very helpful but, Please can you do one for different charges

[apexwindowcleaningservices]

I don't know about q1, q2 or q3 but you are definitely a qt

[AH-pbcm]

Amazing! I loved the detailed explanation. Is it possible to post more, perhaps tougher questions? Thank you again so much!

[nivalostan]

Thank you for the lecture. helps a lot I have a question...
what will be the direction of the force?

[physicsKTSS]

Thanks for the simplified explanation 👍

[Thallium-tnsh]

Thanks for the easy to understand video. Please continue doing those.
Now, how do I calculate the position of the electrons after, lets say, one second?

[TheJonvines]

what if the forces arent at a right angle? How would you calculate the force on q1 then?

[roselfamtraveltv]

youre keeping me inspired from studying :)

[ShubhamSharma-veei]

Your teaching & presentation skills are remarkable ^_^

[rayharmuth]

Very nice! I like the detailed explanation and friendly presentation. Is there any chance you could find the component vectors? I have a similar problem, only I need to find the component vectors. Also, would you mind if I subscribe to your channel? I could really use your videos for my General Physics II class at Robert Morris University. My brother is also a physics major, so these videos helped both of us out. Thank you again!