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How to determine the charged particles between a distance?

  1. Jul 17, 2011 #1
    I would like to determine the negative charged level on q2 particle, referring to following image, q1 is charged particle with x unit of positive charge, which q1 diameter is 80 cm, on the other hands, q2 is a neural particle, which q2 diameter is 30 cm. Both charged particles are separated in d distance.
    Does anyone have any suggestions on how to determine the negative charged level on left-hand side of q2 based on the distance and positive charged level of q1? Is there any formula to determine this value?
    Thanks in advance for any suggestions
    2Particles.jpg
     
  2. jcsd
  3. Jul 18, 2011 #2

    SammyS

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    Are they conductors?

    Is d the center to center distance?
     
  4. Jul 18, 2011 #3
    They must be conductors ... or else, there will be no induced charges.
     
  5. Jul 18, 2011 #4

    SammyS

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    To cupid: q1 would not need to be a conductor. If it were not a conductor, I think the problem is more difficult to solve.

    To oem7110: If the spheres are conductors, then what do you know about the surface of each sphere?
     
  6. Jul 18, 2011 #5
    To SammyS:
    Let assume, both particles are conductors, so positive and negative charges are free to move on its surface area, and d is the center to center distance.
    Does anyone have any suggestions?
    Thanks in advance for any suggestions
     
  7. Jul 18, 2011 #6

    SammyS

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    The surface of each conductor will be an equi-potential surface.

    Have you been introduced to "image" charges at all?
     
  8. Jul 18, 2011 #7
    What is "image" charges?

    In q2 particle, which is neutral originally, because q1 with positive charged particle is getting closer to q2, so the negative charged level on left-hand side and the positive charged level on right-hand side for q2 particle, but I don't know what happen at the top and bottom, will it be neutral?
    Does anyone have any suggestions on how to determine the negative charged level on left-hand side of q2 based on the distance and positive charged level of q1? Is there any formula to determine this value?
    Thanks in advance for any suggestions

    2Particles.jpg
     
  9. Jul 19, 2011 #8
    Could you please give me any suggestions on what Image charges are about?

    Do you find any lecture under MIT talking about this issue? so I can learn what "image" is about if it related to my issue.

    I look forward to your reply
    Thank everyone very much for any suggestions

    Lec 23 | MIT 8.02 Electricity and Magnetism, Spring 2002
    http://www.youtube.com/watch?v=HSN2hSULTi4&feature=related
     
  10. Jul 19, 2011 #9

    SammyS

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    Sorry, I've been traveling. If you haven't been introduced to image charges, then you likely are expected to do this problem by some other method.

    What level is this course? At what place are you in your course?

    I assume you've had Coulomb's Law. Have you learned about electric potential?
     
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