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!

Properties of neutral charges?

  1. Aug 19, 2013 #1
    Three objects (A, B, and C) are brought close to each other one at a time. A and B attract, but B and C repel. Simple true/false question involving "is this one positive/negative/etc." What I'm unsure about is whether or not A could possibly be neutral, or more specifically, is there any way to tell with certainty based on the limited information whether or not it IS neutral?
     
  2. jcsd
  3. Aug 19, 2013 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    There are no neutral charges, only positive and negative charges. A neutral particle is neither attracted to nor repulsed by a charged particle.
     
  4. Aug 19, 2013 #3
    Fair enough. Thank you!
     
  5. Aug 20, 2013 #4

    ehild

    User Avatar
    Homework Helper
    Gold Member

    A charged object can attract neutral ones by polarizing them. A rubbed plastic rod (or a simple comb) will attract small and light paper pieces. See: http://www.physicsclassroom.com/class/estatics/u8l1c.cfm (experiment with a rubbed balloon and bits of paper). So you are right, A can be neutral, too.

    The problem should have been asked about three point-like charged objects.

    ehild
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted