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Homework Help: Field lines

  1. Nov 12, 2015 #1
  2. jcsd
  3. Nov 12, 2015 #2

    Ray Vickson

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    Science Advisor
    Homework Helper

    Because they point in the direction of the force on a POSITIVE charge.
  4. Nov 12, 2015 #3


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    Staff: Mentor

    It's the agreed upon convention. After all, "positive" and "negative" are just names we have attached to the two charge types. It could've gone either way. Having decided to make one "positive" and the other "negative", the field line directions follow in order to make them agree with the resulting vector math.
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