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Find magnetic field strength and maximum force

  1. Dec 20, 2012 #1
    1. The problem statement, all variables and given/known data

    magneticfield_zpse9666f81.jpg

    2. Relevant equations

    Force = Current * Length * Field Strength * sin(theta)

    (Force/ Length)/(Current * sin theta) = Field Strength



    3. The attempt at a solution

    (.28 N/m)/ (14 A * sin 27 degree) = .044 T or 44mT
     
  2. jcsd
  3. Dec 20, 2012 #2

    haruspex

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    The 'try again' image seems to indicate the answer you entered was 4, not 44.
     
  4. Dec 20, 2012 #3
    thanks. apparently I did not see the milli Tesla and when I rounded my answer it threw my answer off . how do I go about finding a maximum force? how do I know if the force I got is actually maximum?
     
  5. Dec 20, 2012 #4
    Maximum force possible is when wire is perpendicular to magnetic field. sin90 = 1, biggest possible. sin (other angles) will result in a smaller answer.

    So maximum force is BIL (B-magnetic field strength, I-current, L-length [full length as totally perpendicular]) B is your previous answer.
     
    Last edited: Dec 20, 2012
  6. Dec 20, 2012 #5
    Thanks! I understand now!
     
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