Net force on a Halbach Array in a uniform magnetic field

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A Halbach Array of permanent magnets does not experience a net force in a uniform magnetic field without motion. Only magnetic monopoles, which have not been observed, would experience a net force in such conditions. A classic compass needle, being a dipole, experiences torque rather than a net force in a uniform magnetic field. This torque causes rotation but does not accelerate the center of mass. Therefore, the discussion confirms that a Halbach Array remains unaffected by net forces in a static uniform magnetic field.
Arshavsky
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I have been unable to determine whether a Halbach Array of permanent magnets would experience a net force in a uniform magnetic field.
 
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Without motion, the only thing that experiences a net force in a uniform magnetic field would be magnetic monopoles, and they haven't been observed (as free particles) yet.
 
Is that true? How about the classic compass needle? It's a normal dipole and it experiences a rotational force in a (to a first degree) uniform field.
 
It is only torque, it is not a net force (that would accelerate the center of mass).
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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