Solve Magnetic Field & Energy Between 2 Equally Magnetized Plates

AI Thread Summary
The discussion focuses on solving a physics problem involving two equally magnetized plates that repel each other. The first task is to calculate the magnetic field (B field) between the plates, given their dimensions and the distance separating them. The second task involves determining the magnetic field energy stored in the space between the plates. The participant has already calculated the angle of deflection and the tension in the supporting string using the weight and the cosine of the angle. The principle of virtual work is suggested as a useful approach for solving these problems.
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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
 
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Hint: use the principle of virtual work.
 

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