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Find the force that the magnetic field applies on the wire

  1. Mar 23, 2016 #1
    1. The problem statement, all variables and given/known data
    Find the force that the magnetic field with B=10^-2 T applies on the wire with length 20 cm when it forms with the force the angle 30 grades when in it passes the intensity 5A.

    2. Relevant equations
    F=B*I(intensity)*l(length)*sin alpha

    3. The attempt at a solution
    F=10^-2*5*0.2*0.5=5*10^-3
    The solution in my book is 3.5*10^-3N
     
  2. jcsd
  3. Mar 24, 2016 #2
    i think by intensity 5A you mean the current through the wire.
    the other angle given "when it forms with the force the angle 30 grades" what grades signifies- see conversion of grades to degree.
     
  4. Mar 24, 2016 #3
    yes the current through the wire is 5 A and 30 grades=pi/6 radian
     
  5. Mar 24, 2016 #4
    So , one grade =pi/180 radians, then why one uses a different names-give reference
     
  6. Mar 24, 2016 #5
    I translated it. but the angle is pi/6 radian
     
  7. Apr 12, 2016 #6
    If you understood the problem, could you tell me if I have done it correctly because my solution is different from the one in the book
     
  8. Apr 12, 2016 #7
    well i looked for the unit grade as angle measurer
    The gradian is a unit of measurement of an angle, equivalent to 1⁄400 of aturn,[1] 9⁄10 of a degree or π⁄200 of a radian.

    It is also known as gon (from Greek γωνία/gōnía for angle), grad, or grade. In continental Europe,
    see details
    https://en.wikipedia.org/wiki/Gradian

    so if you use the conversion does the result change?
     
  9. Apr 12, 2016 #8
    the underlined statement is also to be clarified- paste a copy of the original problem.
     
  10. Apr 12, 2016 #9
    http://tinypic.com/view.php?pic=xcnj0n&s=9#.Vw0EfJx95kg
    We use this kind of relationship in physics everyday. I'm sure that the angle is pi/6 radian
     
  11. Apr 12, 2016 #10
    http://postimg.org/image/tk7177rg7/
    In this image Intensity is 5 Amper, the angle is pi/6 radian
     
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