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Jun 21st, 2018
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  1. Manipulate[ContourPlot[
  2. q1/Norm[{x, y} - p[[1]]] + q2/Norm[{x, y} - p[[2]]], {x, -2,
  3. 2}, {y, -2, 2}, Contours -> 10], {{q1, -1}, -3, 3}, {{q2, 1}, -3,
  4. 3}, {{p, {{-1, 0}, {1, 0}}}, {-1, -1}, {1, 1}, Locator},
  5. Deployed -> True]
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