1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Potential from a ring of charge

  1. Apr 12, 2009 #1
    1. The problem statement, all variables and given/known data

    http://img15.imageshack.us/img15/3462/poth.th.jpg [Broken]

    How can I find the potential at the point p above?

    2. Relevant equations



    3. The attempt at a solution

    I really have no idea where to start at
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Apr 12, 2009 #2

    LowlyPion

    User Avatar
    Homework Helper

    I'd suggest that you use geometry.

    Drop a perpendicular to the plane of the ring. Call it P' The distance then is a right triangle that has one side constant, P-P'. Your dq element distances from P can then be determined by the distance expression of the elements of the ring in the x-y plane to P' and the other leg P-P'.
     
  4. Apr 12, 2009 #3
    I don't quite understand what you mean.. please elaborate
     
  5. Apr 12, 2009 #4

    rl.bhat

    User Avatar
    Homework Helper

    Drop a perpendicular from p to the axis of the coil. Let PP' = x be the the perpendicular. Let O be the center of the coil and R be the radius of the coil. Electric field due to the coil having charge Q is given by
    E = kQ*OP'/(R^2 + OP'^2)^3/2
    The potential gradient along P'P is given by deltaV = E.dx = E*dx*cos(theta) = -E*dx*x/OP' .Substitute the value of E. Find the integration from x = 0 to x = x.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Potential from a ring of charge
Loading...