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Direction of the magnetic force

  1. May 21, 2012 #1
    1. The problem statement, all variables and given/known data
    The problem is in the attached image.


    2. Relevant equations



    3. The attempt at a solution
    I used the third left hand rule (seen in one of the attached images) and pointed my thumb (direction of the current) downwards because the question states that the current flows from point E to point F. However, when I point my thumb downwards I seem to get B as the answer... and my answer key says that A is the answer. I need a bit of clarification please (a drawing might be helpful.)
     

    Attached Files:

  2. jcsd
  3. May 22, 2012 #2

    tiny-tim

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    Hi Nitrate! :smile:
    No, for current, it's the right-hand rule. :wink:

    (It's only the left-hand rule for electrons, because the current is defined as going the opposite way to the electrons)
     
  4. May 22, 2012 #3
    My mistake. That being said, I still don't understand why A is the answer.
     
  5. May 23, 2012 #4

    tiny-tim

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    Hi Nitrate! :smile:
    I don't get it :confused:

    if your right thumb is down, and your fingers are pointing along the field (from N to S, ie from C to D),

    then isn't your palm is pointing towards you, ie towards A ?​
     
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