Net force on a Halbach Array in a uniform magnetic field

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Discussion Overview

The discussion centers on whether a Halbach Array of permanent magnets experiences a net force when placed in a uniform magnetic field. The scope includes theoretical considerations of magnetic forces and the behavior of magnetic dipoles in such fields.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions the net force on a Halbach Array in a uniform magnetic field.
  • Another participant asserts that only magnetic monopoles would experience a net force in a uniform magnetic field, noting that monopoles have not been observed as free particles.
  • A third participant challenges this by referencing the behavior of a compass needle, suggesting that it experiences a rotational force in a uniform magnetic field.
  • A later reply clarifies that the compass needle experiences torque rather than a net force that would accelerate its center of mass.

Areas of Agreement / Disagreement

Participants express differing views on the nature of forces acting on magnetic dipoles in a uniform magnetic field, indicating that the discussion remains unresolved.

Contextual Notes

There are limitations regarding the definitions of force and torque, as well as the assumptions about the behavior of magnetic dipoles versus monopoles in uniform fields.

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).
 

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