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Negative values of magnetic fields strength obtained?

  1. Apr 3, 2016 #1
    1. The problem statement, all variables and given/known data

    We were asked to use a Hall probe (in units of Guass) to measure the magnetic field strength in 0.5 cm increments away from a wire carrying 4 A of current. As we got further and further away from the wire our B value got smaller and smaller. Eventually they became negative! What does this mean? If I calculate a theoretical B value using the standard equation then how am i supposed to account for the negative value



    2. Relevant equations

    Magnetic field strength equation for a wire = Permitting constant* current/2* pi* d


    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Apr 3, 2016 #2

    SammyS

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    Hello Mohummed Kazmi. Welcome to PF !

    What was the reading with no current?

    How far away from the return current, or any other current was the probe?
     
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