Im working on a school project using stationary magnets to cause the rotation (torque) of a drum with magnets adhered to it. I have skimmed through an electrodynamics textbook but I am finding it very difficulties to know what I am searching for without attending a formal class on electrodynamics.
Setup: I have a drum mounted such that is can rotate about its center axis. I apply a triangular magnet onto the drum, with the triangle pointing tangentially. I mount a stationary magnet in a position that it can interact with the triangular magnet. The stationary magnets wants to spin the drum until it meets the widest part of the triangle.
Now I want to be able to calculate the attraction between these magnets. How would I begin to calculate this?
The stationary magnet is black, blue is the magnet applied to the drum.