Physics 12.2.1b - Coulomb`s Law - Simple Examples

Some simple example problems involving Coulomb's Law. Each problem is set up and the solution is explained. From the physics course by Derek Owens. The distance learning course is available at http://www.derekowens.com

Category:

Education

Tags:

• Physics
• Coulomb
• Coulombs Law
• Coulomb`s Law
• electrostatic
• electrostatic force
• electric force
• inverse square
• inverse square law
• homeschool
• distance learning
• Derek Owens

[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.

[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.

[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.

[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.

[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!

[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.

[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 ....

[MSuzetteReyes]

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

[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

[033455124]

@x0xbethaNyyx0x that is the value of "k"

[HellasRocks4Evar]

thank you Mr. Owens!