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Basic electrostatic induction

  1. Jun 23, 2010 #1
    1. The problem statement, all variables and given/known data
    When a positively charged ball is brought near a neutral conductor(a light metal ball), will the metal ball be attracted towards the charged ball?


    2. Relevant equations

    This is electrostatic induction.


    3. The attempt at a solution
    Like a charged rod can attract the paper(insulation) by the polarization of atoms.
    So similarly, I think the lots of electrons will move to one side of metal ball and the whole metal ball will be attracted to the +ve charged ball. The attractive force is even greater than the insulator like plastic ball.

    Thanks~~
     
  2. jcsd
  3. Jun 23, 2010 #2

    kuruman

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    Your reasoning is correct.
     
  4. Jun 23, 2010 #3
    Thanks
    However, in my text there's only description of polarization but no description of the attraction of conductors. Same thing happens on the web. Also, people always show attraction of water flow, paper, hair;but not conductor.
    So why's that? Is it because the attraction of insulator is much larger and observable?????
    Thanks!!!
     
  5. Jun 23, 2010 #4

    kuruman

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    Yes, it is easier to see flowing water being deflected electrostatically than a metal conductor. For conductor attraction on the web, see for example

    http://www.physicsdemos.com/demo.php?demo_id=400&path_id=69 [Broken]
     
    Last edited by a moderator: May 4, 2017
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