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B Electric field lines

  1. Jul 30, 2017 #1
    Hi, I'm reading the textbook and there is my image.
    http://imgur.com/a/9BqHm

    It says "The field vector E bar is tangent to the electric field line at each point".
    I might want to ask what "tangent" means in this sentence? Sorry to ask that stupid question.
     
  2. jcsd
  3. Jul 30, 2017 #2

    cnh1995

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  4. Jul 30, 2017 #3
    It means any electricfield-line is parallel with electricfield vector ##\vec E## at any point.
     
  5. Jul 30, 2017 #4
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