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Aug 30th, 2016
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  1. ((9*10^9) (18.9*10^-9*2*10^-9)/(.01^2)) * 2 * sin(60)
  2. Triangle question, 18.9 as the upper charge
  3.  
  4. [9*10^9 [ (-797 * 10^-9) / sqrt(2^2 + 3.2^2) + (538*10^-9)/3.2 ]] - [9*10^9 [ (-797 * 10^-9) / sqrt(2^2 + 1.8^2) + (538*10^-9)/1.8 ]]
  5. Circle question, -797 as ring charge, radius 2 m (as in 2^2), 538 center charge
  6.  
  7. [9*10^9 * (38*10^-9 / .6 + -73*10^-9 / sqrt(.6^2 + .8^2))] - [9*10^9 * (38*10^-9 / sqrt(.6^2 + .8^2) + -73*10^-9 / .6)]
  8. Point to point question, 38 as one charge, -73 as the other. .6 and sqrt(...) as distances from charges to points A/B
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