Action reaction pair of magnetic force

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Discussion Overview

The discussion revolves around the action-reaction pair of magnetic forces, particularly in the context of Newton's third law and the momentum of electromagnetic fields. Participants explore the implications of these concepts in physics, including how they relate to the equation qvb.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant expresses confusion about the reaction of magnetic force and its relationship to the equation qvb.
  • Another participant suggests that Newton's third law needs to be generalized when discussing fields, noting that it relates to the conservation of momentum.
  • This participant also mentions that while it may not be intuitive to discuss forces on a field, the momentum of the field can be considered, indicating that any force exerted by the field results in an equal and opposite change in the field's momentum.
  • A question is raised about the concept of momentum of the magnetic field, with a request for reading suggestions on the topic.
  • One participant provides a link to a resource on electromagnetic theory as a potential reading suggestion.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as there are differing levels of understanding and interpretation regarding the momentum of magnetic fields and the application of Newton's third law in this context.

Contextual Notes

The discussion highlights a lack of familiarity with the concept of momentum in magnetic fields, indicating that further exploration and clarification may be needed. There are also unresolved questions regarding the implications of these concepts in practical scenarios.

rtshah
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I am not able to understand reaction of magnetic force and how it is equal to qvb ?
 
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When you start looking at fields you have to generalize Newton's third law. Basically Newtons third law expresses the conservation of momentum. While it may not make a lot of sense to talk about the force on a field, you can certainly talk about its momentum. Any force that the field exerts on matter causes an equal and opposite change in the momentum of the field.
 
DaleSpam said:
When you start looking at fields you have to generalize Newton's third law. Basically Newtons third law expresses the conservation of momentum. While it may not make a lot of sense to talk about the force on a field, you can certainly talk about its momentum. Any force that the field exerts on matter causes an equal and opposite change in the momentum of the field.

What is the momentum of the B field? I haven't heard of this concept yet. Any suggestions on some good reading in this subject?
 

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