# Work done separating charge

by vaironl
Tags: charge, separating, work
 P: 27 1. The problem statement, all variables and given/known data How much work is done to separate an electron from a proton by a distance of 0.1 m? 2. Relevant equations Work = F * d 3. The attempt at a solution I Tried finding the electric force and then plugin it into the Work formula Therefore (-2.31*10^-26N)(0.1m)?
 P: 927 W = F*d assumes the force is constant along the path. In this case, the force changes as you move the charges apart.
P: 27
 Quote by daveb W = F*d assumes the force is constant along the path. In this case, the force changes as you move the charges apart.
I still do not know how exactly would I be able to find that work formula

P: 29

## Work done separating charge

Do you know how to do integrals and do you have an equation for the force between two charges that you can look up?
P: 27
 Quote by Alucinor Do you know how to do integrals and do you have an equation for the force between two charges that you can look up?
No, sorry to disappoint you and myself, but I don't have a clue about integrals.

I know that the force between to charges is Felectric = (k)(q1)(q2)/(r^2)
 P: 29 Not a problem, there are a few ways to do problems like this one. Do you know the relationship between work done and changes in potential energy and have an equation for the electric potential?
 PF Patron HW Helper Sci Advisor Emeritus P: 7,077 How close are the electron & proton to begin with ?
P: 27
 Quote by Alucinor Not a problem, there are a few ways to do problems like this one. Do you know the relationship between work done and changes in potential energy and have an equation for the electric potential?
I do not know any of those, I will give my book a look and come back to that. I was thinking about it rather than doing it, a teacher I know tells me if I understand the concept I should be able to conquer all questions. Sounds weird but for some reason I see it as a good statement.

 Quote by SammyS How close are the electron & proton to begin with ?
The question does not give a starting position.
 P: 29 Intro physics questions are easy mathematically, it is the concept that is difficult, as well as the visualization of the problem. So your professor is pretty correct imho. I would look up those things I recommended as that is the main way I think it could be done relatively easily without calculus.
P: 27
 Quote by Alucinor Intro physics questions are easy mathematically, it is the concept that is difficult, as well as the visualization of the problem. So your professor is pretty correct imho. I would look up those things I recommended as that is the main way I think it could be done relatively easily without calculus.
That was exactly what my teacher told me. Though, he told me there is no point in plugin numbers into a formula knowing they will come out right, if you don't know what is really going on (concept).

But an Electric field has the following formulas.

E = f(electric)/charge = N/C = V/Meter = (J/C)/Meter

Would this be correct? because I could then isolate the Joules unit
PF Patron
HW Helper