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Magnetic Field Help!

  • Thread starter Jgamita10
  • Start date
  • #1
2
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Homework Statement



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.

Homework Equations





The Attempt at a Solution


I so far solved for the angle, and solved for the tension in the string using W=Mg=Tcosθ
 

Answers and Replies

  • #2
rude man
Homework Helper
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Hint: use the principle of virtual work.
 

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