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Elementary Charge

  1. May 1, 2005 #1
    Calculating charge and force of electric repulsion

    Calculate the force of electric repulsion between two small spheres placed 1m apart if each has a deficit of 1x10^8 electrons.

    I tried this and only got r=1m and N=1x10^8

    I don't know the equation needed for this please help..

    Thomas
     
    Last edited: May 1, 2005
  2. jcsd
  3. May 1, 2005 #2

    Andrew Mason

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    Do you know the charge (in Coulombs) of the electron? Just use that in the Coulomb force equation.

    AM
     
  4. May 1, 2005 #3
    so what would q be? Whats the charge on both spheres?
     
  5. May 1, 2005 #4

    Andrew Mason

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    If each has a deficit of 10^8 electrons, each has 10^8 more protons than electrons. So each has a charge of +10^8 e, where e = -1 x charge of one electron. The charge of one electron is -1.602 x 10^-19 C.

    AM
     
  6. May 1, 2005 #5
    so its (1.602x10^-19)(10^8)=charge?
     
  7. May 1, 2005 #6

    Andrew Mason

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    Well, that is one of the charges. The other one is the same. Do you know how to apply Coulomb's law to find the force at a separation of one meter?

    AM
     
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