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B Magnetic needle

  1. May 11, 2016 #1

    ENE

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    Hello,
    How to perform and know north south from magnetic needle compass??
    as in this picture it show North + south = south + north
    so, how to find earth direction??
     

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  2. jcsd
  3. May 11, 2016 #2

    anorlunda

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    Welcome to PF.

    The picture you attached says "compass points north". That is the answer.

    Are you confused that the point of the needle is the magnets S pole? Ignore that. N attracts S, so we make the S end of the compass needle look like an arrow that points N.
     
  4. May 11, 2016 #3

    ENE

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    ok, thanks.
    How to do experiment Stewarttangent galvanometer?
     
  5. May 11, 2016 #4

    anorlunda

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    That video you posted explains pretty well, so please be more specific with your question.
     
  6. May 11, 2016 #5

    ENE

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    I mean what is the application of this experiment ?
    is to find magnetic field by coil it self??
     
  7. May 11, 2016 #6

    anorlunda

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    That is clearly explained in the video. It demonstrates the "principle" explained in the video and the "applications" explained in the video.
     
  8. May 12, 2016 #7

    ENE

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    Hello,
    At 4:12 time it say the deflection is between 30 and 60 how?
    at rest it was 0 degree initial.
    so, deflection should be in 0-30 or 0-60??
     
    Last edited: May 12, 2016
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