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Magnetic Field Help

  1. Apr 8, 2014 #1
    1. The problem statement, all variables and given/known data

    Two very thick equally-magnetized square plates of
    side 0.23m and of mass 20 g, are hung by threads
    20.0 cm long from a common point. The plates repel and
    deflect from each other through a very small angle.

    a) Calculate the B field between the two plates, if the
    distance between them is 0.123 cm?

    b) Calculate the magnetic
    field energy stored between the two plates.

    2. Relevant equations

    3. The attempt at a solution
    I so far solved for the angle, and solved for the tension in the string using W=Mg=Tcosθ
  2. jcsd
  3. Apr 8, 2014 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    That's great.
    Please show your working, and you best attempt at the bit you got stuck on.
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