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Homework Help: Electric potantial

  1. Jan 28, 2007 #1
    I need you guys to check some of my answers for the following problem, which has 7 different cases. Each case has to be answered by stating the direction of the test charge with the electric field and whether the electric potantial decreases from point a to b. Below are two sample pictures of what I'm describing.

    http://img256.imageshack.us/img256/6502/qqug4.jpg" [Broken]

    here are the different scenarios:

    plus charge emitting a field line to the right, point a to b, where a is closser to the charge. test charge is moving towards the plus charge
    -I said test charge goes against E, and P. increases

    same E field, negative test charge moves away from the plus charge
    -I said negative test charge moves along E, and P. decreases

    same E field, negative test charge moves toward plus charge
    -I said negative test charge moves against E, P. increases

    now there is a negative charge emmiting a field line coming from the right toward itself. test charge moves away from the E field
    -I said test charge moves against E, P. increases

    same E field, test charge moves toward E field.
    -I said test charge move along E, P. decreases

    same E field, negative test charge moves away from the E filed.
    -I said negative test charge goes against E, P. increases

    same E field, negative test charge moves toward E field
    -I said negative test charge goes along E, P. increases

    I hope thats clear
    thanks a lot guys
     
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Jan 28, 2007 #2

    mjsd

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    what about +ve test charge moving away from the +ve source charge?
     
  4. Jan 28, 2007 #3
    The professor used that as an example, so i don't need it.
    good eye though
     
  5. Jan 28, 2007 #4
    can anyone tell me if these are correct or not please?
     
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