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Homework Help: Work done by electric field

  1. Jan 18, 2017 #1
    1. The problem statement, all variables and given/known data
    question 8.JPG

    Hi everyone, I am having trouble solving this question. I know that the right answer is d.

    2. Relevant equations
    No equations here, only conceptual stuff.

    3. The attempt at a solution

    Say I have the following points: A and B

    A. B.

    The negative charge is moving to the right, and if the electric field does positive work on it, then the electric force is going to the right, which means that the electric field is pointed leftwards from point B to point A.

    This means the negative charge is moving from low to high potentials.

    I thus would think that the answer is (C), increases, but the right answer apparently is (D) increases.

    Could anyone please help me figure out why this is the case?

    Thanks in advance for the help, and make it a great day!
  2. jcsd
  3. Jan 18, 2017 #2


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    Homework Helper
    Gold Member
    2017 Award

    Yes, the charge moves from lower to higher potential. But, how do you relate the change in potential energy to the change in potential?
  4. Jan 18, 2017 #3
    To be even more explicit than TSny, potential energy and potential are not the same thing. This problem is a test to see if you know the difference.
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