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Electric field lines number 51 TBR

Discussion in 'MCAT Study Question Q&A' started by dahmsom, Aug 3, 2015.

  1. dahmsom

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    ImageUploadedBySDN Mobile1438655449.266043.jpg the answer is D BUT the explanation says a and b are along the same potential line meaning it's perpendicular to the field line. So If they are exactly vertically to each other they are perpendicular to the field line ? So they would have the same potential energy then ??
     
  2. frodo25

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    Yes they would have the same potential, so D is the correct answer since this question is asking for which of the following is NOT correct.
     
  3. BerkReviewTeach

    BerkReviewTeach Company Rep & Bad Singer
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    The equipotential lines (surfaces) are perpendicular to the field lines, which would mean in they case that the same line that is perpendicular at point a would have to be perpendicular at point b. While this is not drawn in, a mirror through the straight field lines (passing through the two charges) would reflect point a into point b. If you don't see this, that;s fine, but if you do, then it should help in believing that point a and point b have the same electrical potential.

    Given that it would take the same amount of work to move a test charge from point a to the charge on the right as it would to move a test charge from point b to the charge on the right, AND the same amount kinetic energy would be generated if a test charged moved from point a to the charge on the left as would be generated if a test charged moved from point b to the charge on the left, then a test charge would have the same potential energy at point a as it has at point b.

    You are correct on all accounts.
     

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