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Energy lost from sphere due to spark

  1. May 13, 2016 #1
    image.jpg 1. The problem statement, all variables and given/known data

    image.jpg
    2. Relevant equations


    3. The attempt at a solution
    I did this :
    1/2 (2.7x10^-6)(150x10^3) - 1/2 (1.575x 10^-6)(75x10^3) =0.143 J
    But the answer is 0.15 , where did I did wrong?
     
    Last edited: May 13, 2016
  2. jcsd
  3. May 13, 2016 #2
    I think it is: [(1/2) x (2.7x150) - (1/2) x (1.35x75)]x10^-3 = 0.152 J
     
  4. May 13, 2016 #3
    Oh whoops, I read off the point wrongly, thanks!
     
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