Discussion Overview
The discussion centers around the Lorentz force experienced by two moving charges that are mutually perpendicular to each other. Participants explore the implications of this scenario on Newton's third law, particularly in the context of electromagnetic interactions and the role of the electromagnetic field in force dynamics.
Discussion Character
- Debate/contested
- Technical explanation
- Conceptual clarification
Main Points Raised
- One participant notes that when one charge crosses the path of another, the force on the first charge appears to be zero while the force on the second charge is non-zero, raising questions about the validity of Newton's third law.
- Another participant suggests analyzing the situation from a frame where one of the charges is at rest to gain clarity on the forces involved.
- It is proposed that the total electromagnetic force, rather than just the magnetic component, must be considered to understand the forces acting on the charges.
- Some participants argue that Newton's third law does not always apply in the context of instantaneous forces in electromagnetic interactions, but it does hold in terms of overall momentum conservation when accounting for the momentum in the electromagnetic field.
- An example involving two wires is provided, illustrating that a wire carrying current exerts a force on another wire that is initially at rest, highlighting the time delay in the magnetic field's effect and the importance of considering the momentum carried by the field.
Areas of Agreement / Disagreement
Participants express differing views on the applicability of Newton's third law in electromagnetic interactions, with some asserting that it does not hold in the instantaneous sense while others emphasize the importance of momentum conservation. The discussion remains unresolved regarding the implications of these viewpoints on the original scenario presented.
Contextual Notes
The discussion involves assumptions about the nature of electromagnetic forces and the frames of reference used to analyze the situation. There are unresolved aspects related to the definitions of forces and the treatment of electromagnetic fields in relation to classical mechanics.