Physics help-Newtons law of gravitation

Ahh, I think I forgot to mention what time.

I meant that the electric potential was 0 at the start of the video before drawing anything in. When he draws in the big Q with the green circle around it (the first thing he draws) electric potential is created.

I think what you were referring to was the little q in the bottom left (blue dot) but I meant the green one in the middle

Thank you so much! But you know the little q, doesn't it also produce an electric potential which can like affect the Big Q.

Oh wait isn't it an electric field and not an electric potential ..electrical potential enenrgy
crap im getting it all mixed up lol

This is where I get confused as well lol

I don't know if this is right, but to try and explain what I think is right is:

The 2 charges are at a point in the electric field. I would think that the little q also creates electric potential, but that's not the reference point we're using. We're using the reference points of infinity to the big Q in the middle of the screen. I imagine if you were to calculate the electric potential at big Q from little q, the Qs would swap and little q would become big Q as that would be the new reference point.

Study.com says electrical potential energy is the energy a charge has due to its relative position to other charges. I just looked it up then, try searching study. Com electrical potential energy as it explains it very well

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Study.com says electrical potential energy is the energy a charge has due to its relative position to other charges. I just looked it up then, try searching study. Com electrical potential energy as it explains it very well

A comment on the underlined statement. It seems that something that was not well explained to a lot of A level Physics students.

In physics, when we talk about potential energy such gravitational potential energy and electrical potential energy, the potential should be considered to be a property of the entire system. rather than of any specific part of the system or object.
Take more example, when a ball of mass m is thrown up on the surface of the Earth, the ball rises through a vertical height h, the gravitiational potential energy (gpe) of the system (ball+Earth) increases by mgh, the kinetic energy of the system also decreases by the same amount. Although in most of the standard A physics textbook, you would tend to see question that ask you to calculate the gpe of the an object in some problem, you should NOT think the gpe that you calculated belongs to the object ONLY.

Going back to the ball+Earth system and consider why the textbooks are using phrases like gpe of the ball. This is because in the ball+Earth system, the Earth is so much massive than the ball, so when there is a decrease in the gpe of the system (ball+Earth) accompanies by an increase in KE of the system (ball+Earth), virtually all of the increase in KE goes to the ball. It is for this reason that we refer to the gpe of the ball rather than (more precisely) of the Earth+ball system.

Similarly when we talk about electrical potential energy (EPE) for two charges, the EPE belongs to system of two charges rather than a particular charge.

Np at all and thanks a lot again Imma look into this website now and what Eimmanuel
attached in their post
Oh and how do you know what is the reference point?

If I remember properly, I believe the questions I got in class would usually be 'calculate the electric potential of a charge 'n' x metres away from a charge y' you'd have to figure out that y is the reference point and that n is the little q, other than that I lose track myself haha

It definitely started to make more sense when I looked it up again after the exams, you're right in the fact that I did not think of it applying to the entire system and it's probably why I found it so confusing

If I remember properly, I believe the questions I got in class would usually be 'calculate the electric potential of a charge 'n' x metres away from a charge y' you'd have to figure out that y is the reference point and that n is the little q, other than that I lose track myself haha

Hey it's me again with another question lol
so at 1:17 of this vid https://www.youtube.com/watch?v=UxYH41vV-DI why is the only pressure atmosphere pressure like what about the pressure from the fluid ?

Can you pls lemme know whenever you get the chance?
Dw if not possible

Eek! I don't think I did anything like this in my course so I'm afraid I can't help you, sorry!

I can take a random guess though lol (Since I've never done this it is literally a stab in the dark haha)

I would assume the point 1 only experiences atmospheric pressure because it is at the top of the water? I would imagine it would be like if we could stand on water, we would only be experiencing atmospheric pressure and not the one from the fluid? Other than that, I have no idea sorry!

Hey it's me again with another question lol
so at 1:17 of this vid https://www.youtube.com/watch?v=UxYH41vV-DI why is the only pressure atmosphere pressure like what about the pressure from the fluid ?

Can you pls lemme know whenever you get the chance?
Dw if not possible

Eek! I don't think I did anything like this in my course so I'm afraid I can't help you, sorry!

I can take a random guess though lol (Since I've never done this it is literally a stab in the dark haha)

I would assume the point 1 only experiences atmospheric pressure because it is at the top of the water? I would imagine it would be like if we could stand on water, we would only be experiencing atmospheric pressure and not the one from the fluid? Other than that, I have no idea sorry!

If I remember properly, I believe the questions I got in class would usually be 'calculate the electric potential of a charge 'n' x metres away from a charge y' you'd have to figure out that y is the reference point and that n is the little q, other than that I lose track myself haha

This website explains it better than I could: https://uk.comsol.com/multiphysics/the-joule-heating-effect

However, I don't remember which equation it concerns as we didn't get an actual topic called 'Joule Heating', it was just encompasses in other things we learned.

Electric PE? I think you're referring to the work done by the electric force.
So most of us know that
F = kQq/r^2

Work done = F * r = ∫ F dr
However, work done by electric force is defined as the work needed to bring a charge from infinity to a distance r
Thus we need to integrate between infinity and r,
Applying L'hopsital rules, we obtain
W = -kQq/r
And that is the work done by electric force.

Cool ain't it? To see how maths relates to physics

As far as I know, I have not come across a physics textbook that use L’Hopital’s rules to derive the electrostatic potential energy between two point charges. You are applying L’Hopital’s rule unnecessary.

It is definitely “cool” for some math inclined students to see how maths is applied in physics.