Point Charges (2 of 10) Work Done Moving a Point Charge thru a Potential Difference

[@themvlek]

Thank you for this step by step easy to understand video

[@stepbystepscience]

You are very welcome!

[@taladiv3415]

Thank you for your efforts to elucidate this topic to us students.

[@stepbystepscience]

It's my pleasure, you're very welcome.

[@samaralabdullah3351]

Excellent explanation

[@stepbystepscience]

Thanks, glad you think so!

[@briannguyen6994]

your videos are awesome! i hope you make more physics playlist stuff!

[@stepbystepscience]

Thanks, will do!

[@briannguyen6994]

@@stepbystepscience can you make videos on how to calculate the electric potential of spheres, line charges, disks, rings , planes ect ?! Lol

[@thrixiegalman4490]

Haha I like the explanation!!! It is like related to relationship. I like it. I really do understand it.

[@stepbystepscience]

thanks for the comment.

[@Shackled]

Excellent work!

[@tiagotassinari1435]

Thank you so much!!!

[@stepbystepscience]

You're very welcome!

[@gagonite1237]

I have a question:If charge is scalar then why +/- sign?like mass is only either zero or positive and time too, but why charge can be both? 🎉

[@stepbystepscience]

Good question, the sign does not have any thing to do with direction. Vector quantities would need a magnitude and a direction. You could think of the + and - as different colors, for example. Does that help?

[@gagonite1237]

@@stepbystepscience thanks for your time and reply sir. Can you please explain elaborately please, maybe you can give me video link which best explains this or MAYBE you can upload yourself video explaining this sir😁. Thank you so much again

[@ajnewyork3690]

why is it not -W = delta U

[@gregorygoulenko5984]

I think its because the force doing the work is external.. if we were talking about the electric force or coulomb force, you have it right, but because its an external force doing the work, we think of it the other way. Newtons third law is all forces are equal and opposite, so our "external work" being positive makes the electric force negative. do you agree or disagree?

[@mattmorris419]

Delta u is final minus initial, thus any positive change in potential energy is caused by a positive work.

[@yaseralosh3371]

Positive change in potential energy means a negative work was done. Why? Work = F*d*Cos(theta). You're moving against the force that's caused by the electric field since the electric field goes from the highest voltage point to the lowest voltage point, and in this example, you are going the opposite way. So the theta would be 180 thus resulting in negative work. Also, when you move an object off the ground, you cause negative work because the force of gravity is going in the opposite direction of your movement. Just if anyone stumbled upon this video that contains false information.

[@fatimaa6835]

do you mean this information is wrong?

[@yaseralosh3371]

It has been long since I studied them. But I'm sure of the work equation above, and that if the charge is moving against the force, the cos(theta) will be "-1". Also, it does not matter if the force applied is positive or negative since we take the magnitude value of it anyway ( it's positive here fyi F=+qv). Just find better study resources, and you won't need my comment.

[@fatimaa6835]

@@yaseralosh3371 بعرف قبل شوي راجعت الماده وطلع صح حكيك حتى اني اصلا جيت التعليقات مشان اتاكد على العموم شكرا

[@yaseralosh3371]

@@fatimaa6835 اهلًا،بالتوفيق ان شاءالله

[@TheDeveBand2023]

exactly, the answer is negative

[@MrAlbashiri]

thank you :)

Awesome

[@stepbystepscience]

Thanks for the comment.