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Magnetism direction

  1. Jul 21, 2017 #1
    1. The problem statement, all variables and given/known data
    A current carrying rod is held horizontally between the poles of a magnet by a magnetic force.
    magnet-current (into the page) -magnet
    determine which side is the north pole of the magnet?

    2. Relevant equations

    3. The attempt at a solution
    If I use the right hand rule, then the magnetic field direction is clockwise around the current.
    Is this right? What do I do next?

  2. jcsd
  3. Jul 21, 2017 #2
    This is the question:

    Attached Files:

  4. Jul 21, 2017 #3

    Doc Al

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    Staff: Mentor

    You don't want the magnetic field created by the current. You want the force on the current due to the magnetic field of the magnet.
  5. Jul 21, 2017 #4

    Doc Al

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    Staff: Mentor

  6. Jul 21, 2017 #5
    To determine the direction of the magnetic field, why do we use the Right hand rule instead of Fleming's left-hand rule? Thanks~
  7. Jul 21, 2017 #6


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    Homework Helper
    Gold Member
    2017 Award

    There are various right-hand rules and left-hand rules that people have invented. Most recent textbooks that I have seen talk only about certain right-hand rules and don't mention any left-hand rules. But if you are familiar with Fleming's left-hand rule, then you can use it for this problem.

    The right-hand rule to which @Doc Al refers is just as good and will yield the same result.
  8. Jul 21, 2017 #7
    Got it! Thank you so much~
  9. Jul 21, 2017 #8
    Hi, thank you! Can you please help me with this? It is a follow- up question of the previous one:
    Screen Shot 2017-07-22 at 9.04.03 am.png
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