Re: Coulomb Force Between A Charge Rod & A Particle



In article <ed4i5l$pcb$2@xxxxxxxxxxxxxxxxxxxxxx>, Adam Teasdale Hartshorne <adam@xxxxxxxxxxxxxxxxx> writes:
Hi All,

I have a simple physics question, which I wonder if somebody could help
me with as I am a computer science person trying to use Coulomb force as
an error metric.

In 3D space, if I have a charged rod, (length l with start and end
points, r1 and r2) and an oppositely charged particle positined at p1,
what is the coulomb force between them?

I am assuming you have to integrate the standard coulomb force between
two particles along the rod (Excuse the poor english),

Yes, that's just what you have to do. Note that there are two
possible cases here:

1) The rod is non conductive and the charge distribution along it is
given (in the simplest case it is a uniform distribution). In this
case plain integration will do.

2) The rod is conductive. In this case, whatever charge is present
on it will redistribute itself due to the presence of the external
charge, so as to keep the rod an equipotential. So, you've a coupled
problem of finding the distribution and the forces. Much more
complicated.

Mati Meron | "When you argue with a fool,
meron@xxxxxxxxxxxxxxxxx | chances are he is doing just the same"
.



Relevant Pages

  • Re: Coulomb Force Between A Charge Rod & A Particle
    ... me with as I am a computer science person trying to use Coulomb force as ... In 3D space, if I have a charged rod, (length l with start and end ... Assuming that the rod's charge density is one unit of charge per one ... for an infinite charged wire. ...
    (sci.physics.research)
  • Re: GR1916 question about g=1?
    ... GR accounts for Coulomb Force! ... electromagnetism. ... "Charge Couple" takes that into account. ... relevance to E&M when you never use the E&M stress-energy tensor? ...
    (sci.physics.relativity)
  • Re: GR1916 question about g=1?
    ... GR accounts for Coulomb Force! ... electromagnetism. ... force in the charge couple. ... Electrically stored energy is just as valid ...
    (sci.physics.relativity)
  • Re: Coulomb Force Between A Charge Rod & A Particle
    ... me with as I am a computer science person trying to use Coulomb force as ... In 3D space, if I have a charged rod, (length l with start and end ... point and the rod, and the axial distance. ... axial component is zero and the force is proportional to 1 / r. ...
    (sci.physics.research)
  • Re: Maxwell Equation, point charges: "exact" numeric solution
    ... In my lecture on ... lecturer is referring to macroscopic electromagnetics (where we describe ... charge in terms of charge density, not as point charges), and the item of ... only calculate the Coulomb force and neglect induction effects. ...
    (sci.physics)