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Electricity and potential energy

  1. Sep 11, 2009 #1
    Two point charges of magnitude 5.21 nC and -2.24 nC are seperated by 29.6 cm. The columb content is 8.98755*10 ^9 N*m^2/C^2. What is the electric potential at a point midway between the charges? Answer in untis of V

    I got the answer for this part= 180.36 V

    The second part of the question asks what is the potential energy of the pair of charges? Answer in units of N*m. That is where I am confused
     
  2. jcsd
  3. Sep 11, 2009 #2

    rl.bhat

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    Potential energy of the system = k*q1*q2/d
     
    Last edited: Sep 12, 2009
  4. Sep 12, 2009 #3
    I dont think you square d. I think it is just d. It doesnt make sense if I want to get it in units of N*m
     
  5. Sep 12, 2009 #4

    rl.bhat

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    Yes. You are right.
     
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