1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    rude man

    User Avatar
    Homework Helper
    Gold Member

    Hint: use the principle of virtual work.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted