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!

Concept question

  1. Feb 6, 2005 #1

    Suppose I have two balls that come into contact to make their charges say q1=q2. Would the charges be equal if the balls were of different size?

    I'd say yes, because mass is not relevant in Coulomb's law.
  2. jcsd
  3. Feb 6, 2005 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    If the balls are conductors, the charges on each ball will move until all charge is at the same electrical potential. Electrical potential on the surface of a conducting sphere is:

    [tex]V = \frac{Q}{4\pi\epsilon_0R}[/tex]

    If the balls are of different size (radius) but equal charge, the potentials will not be the same. So when they touch the charges will move so that the potential V for each is the same (ie. a sphere half the radius as the other, will have half the charge as the other).

    Last edited: Feb 6, 2005
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Concept question
  1. Concept Question (Replies: 4)

  2. Concept Question (Replies: 9)

  3. Concept question (Replies: 4)

  4. Concept question. (Replies: 1)

  5. COncept question (Replies: 3)