Discussion Overview
The discussion revolves around the question of whether a magnetic field can create angular momentum in a suspended object by aligning the spins of electrons. Participants explore theoretical implications, historical effects, and specific models related to this concept.
Discussion Character
- Exploratory
- Technical explanation
- Conceptual clarification
- Debate/contested
Main Points Raised
- One participant suggests that aligning electrons with a magnetic field could lead to a macroscopic change in angular momentum.
- Another participant interprets this as a description of a permanent magnet motor, asserting that the answer is yes, a magnetic field can create angular momentum.
- A different viewpoint clarifies that the proposed model does not involve alternating current, which is typically required for motors, and questions whether a strong stationary magnetic field could indeed result in a change in angular momentum.
- One participant references the Einstein-de Haas effect, stating that total angular momentum is conserved and that the object would rotate to counteract the spin angular momentum.
- Another participant expresses agreement with the reference to the Einstein-de Haas effect, indicating it aligns with their thoughts.
- A participant provides links to the Feynman Lectures, discussing the historical context of the Einstein-de Haas experiments and their analysis in terms of classical electromagnetism.
- One participant reiterates that their model does not describe a motor, emphasizing the use of direct current and a permanent magnet in a homopolar motor.
Areas of Agreement / Disagreement
Participants express differing views on whether the original proposal constitutes a motor and whether a magnetic field can create angular momentum. There is no consensus on the implications of the Einstein-de Haas effect or the applicability of the proposed model.
Contextual Notes
Participants highlight various assumptions, such as the nature of the magnetic field (stationary vs. alternating) and the conditions under which angular momentum might be observed. The discussion includes references to historical experiments and theoretical frameworks that may not fully resolve the current inquiry.