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Homework Help: A Homemad Capacitator Question

  1. Jan 12, 2010 #1
    1. The problem statement, all variables and given/known data
    The homemade capacitor is assembled by placing two 6 in pie pans 8 cm apart and connecting them to the opposite terminals of a 9 V battery.

    (a) Estimate the capacitance.
    ___ pF
    (b) Estimate the charge on each plate.
    ____ pC
    (c) Estimate the electric field halfway between the plates.
    ___ V/m
    (d) Estimate the work done by the battery to charge the plates.
    ____ J

    2. Relevant equations

    ---

    3. The attempt at a solution
    I have no idea where to start
     
  2. jcsd
  3. Jan 12, 2010 #2

    ideasrule

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    What's the capacitance of a parallel-plate capacitor?
     
  4. Jan 12, 2010 #3
  5. Jan 12, 2010 #4

    ideasrule

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    Yes, so you should be able to calculate the capacitance of the homemade capacitor, which is essentially two parallel plates.
     
  6. Jan 12, 2010 #5
    Can you point of which formula(s) i should use? Thanks
     
  7. Jan 12, 2010 #6

    ideasrule

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  8. Jan 12, 2010 #7
    What does A or D refer to? and What is the Epslion number?
     
  9. Jan 12, 2010 #8

    ideasrule

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    I think you need to reread the chapter in your textbook about capacitors (and possibly the chapter about Gauss' law).
     
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