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Homework Help: Right Hand Rule

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  1. Apr 1, 2015 #1

    minimario

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    1. The problem statement, all variables and given/known data
    9BjIJ3c.png

    2. Relevant equations
    Right Hand Rule

    3. The attempt at a solution
    I can get the magnitude, but cannot get the directions from the RHR. Can somebody make video/explain?

    Thanks!
     
    minimario, Apr 1, 2015
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  3. Apr 1, 2015 #2

    berkeman

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    Can you post a sketch and your work please? That will help us help you figure this out. Thanks.
     
    berkeman, Apr 1, 2015
  4. Apr 1, 2015 #3

    minimario

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    It is just the right hand rule...what "sketch" is there?
     
    minimario, Apr 1, 2015
  5. Apr 1, 2015 #4

    berkeman

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    The problem statement involves a 3-dimensional problem. The solution involves a sketch with 3-d coordinates and calculations. Are you asking us to reproduce all of your work in order to help you? Please post your detailed sketch and calculations so that we can help you.
     
    berkeman, Apr 1, 2015
  6. Apr 1, 2015 #5

    minimario

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    I don't need the magnitude part. I need the direction part... and 3d coordinates are not needed, the right hand rule is.
     
    minimario, Apr 1, 2015
  7. Apr 1, 2015 #6

    berkeman

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    You are not helping. I'm out. Hopefully somebody else can help you.
     
    berkeman, Apr 1, 2015
  8. Apr 1, 2015 #7

    minimario

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    ?? What do you mean?
     
    minimario, Apr 1, 2015
  9. Apr 1, 2015 #8

    haruspex

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    Quote the right hand rule, as it applies to a moving charge in a magnetic field.
    Alternatively, quote the equation as a cross product and quote the rule as it relates to cross products.
     
    haruspex, Apr 1, 2015
  10. Apr 1, 2015 #9

    uselesslemma

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    I think you need a refresher on the right hand rule. You may find the first sentence useful.

    http://en.wikipedia.org/wiki/Right-hand_rule

    The right-hand rule is defined for use in 3D coordinates. Furthermore, you should generally begin any physics problem by defining a convenient set of coordinates.
     
    uselesslemma, Apr 1, 2015
  11. Apr 1, 2015 #10

    minimario

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    Right hand rule: point thumb in direction of v, fingers in direction of B, then F is direction of palm.
     
    minimario, Apr 1, 2015
  12. Apr 1, 2015 #11

    uselesslemma

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    Then what is your question?
     
    uselesslemma, Apr 1, 2015
  13. Apr 1, 2015 #12

    minimario

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    I cannot get the direction.. do you have a picture of your right hand?
     
    minimario, Apr 1, 2015
  14. Apr 1, 2015 #13

    uselesslemma

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    IMG_0037_2.jpg
     
    uselesslemma, Apr 1, 2015
  15. Apr 1, 2015 #14

    minimario

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    I meant, in the position of this problem, with thumb, fingers oriented in position
     
    minimario, Apr 1, 2015
  16. Apr 1, 2015 #15

    haruspex

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    So point your right thumb in the direction of the current (which way is that?) and your fingers in the direction of the field (which way is that?)
     
    haruspex, Apr 1, 2015
  17. Apr 1, 2015 #16

    minimario

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    I cannot bend my hand so far...
     
    minimario, Apr 1, 2015
  18. Apr 1, 2015 #17

    haruspex

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    At least answer my questions about directions, or I too will quit the thread. You are not trying very hard to help others help you.
     
    haruspex, Apr 1, 2015
  19. Apr 2, 2015 #18

    minimario

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    Oh, I already know those ones, it's trivial. Current goes toward east, magnetic field is 75 degrees below horizontal...
     
    minimario, Apr 2, 2015
  20. Apr 2, 2015 #19

    haruspex

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    ... but what direction is the magnetic field geographically?
     
    haruspex, Apr 2, 2015
  21. Apr 2, 2015 #20

    minimario

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    Would be 75 degrees downward
     
    minimario, Apr 2, 2015
  22. Apr 2, 2015 #21

    haruspex

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    That's not a geographical direction. N, S, E, W....?
     
    haruspex, Apr 2, 2015
  23. Apr 2, 2015 #22

    minimario

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    South
     
    minimario, Apr 2, 2015
  24. Apr 2, 2015 #23

    haruspex

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    So point your thumb E, your fingers S and 75 degrees down, with your hand flat. Which way is your palm facing?
     
    haruspex, Apr 2, 2015
  25. Apr 2, 2015 #24

    minimario

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    Toward the north and down?
     
    minimario, Apr 2, 2015
  26. Apr 2, 2015 #25

    haruspex

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    Yes. Down at what angle?
     
    haruspex, Apr 2, 2015
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