Magnetic Field Help!

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

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