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Homework Help: Electric Forces

  1. Oct 18, 2004 #1
    Two point charged objects produce an electric force on each other of 6.20 * 10^-2 N. What is the electric force if the distance between increases three times?

    I understand that this formula can be used, Fe=(kq1q2)/R^2, but how can you determine K and R from this formula. Any help would be appreciated.
  2. jcsd
  3. Oct 18, 2004 #2


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    It's simple ratios and proportions. Write out the two forces for each case then divide one equation by the other - the K will cancel out and so will the R if you use the information provided.
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