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Be able to input (x,y) and Coulombs of point on plane and generate electric field plot. Also be able to add as many points as possible.

Thanks This is what I want, but not random points:

Electric Field Plot

SeedRandom[1234567];
q = RandomReal[{-1, 1}, 6];
r0 = RandomReal[{-3, 3}, {6, 2}]
q = q - Total[q]/6;
phi = Sum[
   q[[i]]/Sqrt[({x, y} - r0[[i]]).({x, y} - r0[[i]])], {i, 1, 6}];
f = -Grad[phi, {x, y}]

Show[StreamPlot[Evaluate[f], {x, -4, 4}, {y, -4, 4}, 
  StreamColorFunction -> "Rainbow", 
  StreamColorFunctionScaling -> False], 
 Graphics[Table[
   If[q[[i]] < 0, {Blue, PointSize[.1*Abs[q[[i]]]], 
     Point[r0[[i]]]}, {Red, PointSize[.1*Abs[q[[i]]]], 
     Point[r0[[i]]]}], {i, 1, 6}]]]
J. M.'s missing motivation
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LightninBolt74
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    Welcome to Mathematica.SE! I suggest the following:
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     – Dunlop Feb 04 '20 at 05:35
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    Please be more precise in what you are asking. Can you show code of what you have tried? – Dunlop Feb 04 '20 at 05:35
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    https://mathematica.stackexchange.com/questions/197715/electric-field-plot How do I do what the person who answered did, but be able to add my own specific points? – LightninBolt74 Feb 04 '20 at 06:45
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    @TarangJanawalkar you just put the points how & where you want them. It’s quite simple if you understand how the code works—q dictates how much charge each point has and r0 creates their physical location. I would recommend you ask for clarification on the question in particular. Now, if you wanted to ask how to make a dynamic manipulate type of thing from this, I think that would make for a good question. Think something like clicking to add points then moving them around as you please? – CA Trevillian Feb 04 '20 at 07:02
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    @CATrevillian thanks for that, yes I know it's simple but I am learning the Wolfram Language, so I don't really know that much. Can I move them around easily? or will that take too much time? – LightninBolt74 Feb 04 '20 at 07:11
  • Update your question with what specifically you’d like to ask & then make an attempt at code. I will see about giving an answer akin to what I referenced if no one else has beaten me to it by tomorrow after work/classes. I recognize learning the language is a slope at first, but if you can take a look at how the random points are outputted & then change them to the coordinate positions you want, along with the charges you would like, I think it will be really helpful for learning the language. It would not be difficult to move them around easily & not take too much time. – CA Trevillian Feb 04 '20 at 07:16

0 Answers0