1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Problem abput electricity

  1. Dec 7, 2012 #1
    1. The problem statement, all variables and given/known data

    We have a charge Q and it's h metres far from the flat surface. Find the force with which acts on the Q charge by the surface
    The answer is: F=kQ2/4h2 i couldn't get it, please help me.

    2. Relevant equations



    3. The attempt at a solution
     
    Last edited by a moderator: Dec 7, 2012
  2. jcsd
  3. Dec 7, 2012 #2

    gneill

    User Avatar

    Staff: Mentor

    Wow! No need to shout (Big loud font) :smile:

    Welcome to Physics Forums, shotikokobaxi.

    What formula(s) are appropriate here? Is the flat surface a conducting surface? If so, what analysis technique is appropriate for calculating the effects of an induced charge?
     
    Last edited by a moderator: Dec 7, 2012
  4. Dec 7, 2012 #3
    we use kulon's force F=kq2/r2 the question is to find the force with which the surface (which hasn't any charges) acts on the Q charge
     
  5. Dec 7, 2012 #4

    gneill

    User Avatar

    Staff: Mentor

    Yes, that's what we call Coulomb's force law for electric charges. It is applicable, but there's a special technique which can be used for cases where one charge induces a charge in an otherwise uncharged conducting surface as you have here. Look up "the method of image charges".
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...
Similar Threads for Problem abput electricity Date
Must we always use absolute value for lens magnification? Yesterday at 3:20 PM
Uniform rod pivoting and block/mass energy problem Thursday at 12:42 PM
Field from two charges Thursday at 3:05 AM
Biot-Savart Problem Tuesday at 1:25 PM
Direction of magnetic field problem (Right Hand Rule) Tuesday at 12:07 PM