Discussion Overview
The discussion revolves around the concept of conservation of momentum in the context of two parallel wires carrying current and the effects of their magnetic fields. Participants explore the implications of timing the currents in these wires and whether such an arrangement could lead to a net thrust without violating fundamental physics principles.
Discussion Character
- Exploratory
- Debate/contested
- Technical explanation
Main Points Raised
- One participant describes a scenario where two parallel wires with current attract each other, suggesting that turning off one wire while the other remains powered could create thrust.
- Another participant expresses skepticism about the feasibility of the proposed timing, suggesting it would violate fundamental physics.
- Some participants note that the arrangement would produce electromagnetic (EM) radiation, which carries momentum and would result in equal and opposite momentum on the wires.
- There is a discussion about the role of near field effects and how they relate to momentum conservation, depending on the frequency of current switching.
- A later reply identifies a flaw in the original thought experiment, emphasizing that both positive and negative transitions in current are necessary to generate a net force, leading to a net zero force from the transient magnetic fields.
- Participants discuss that both wires emit radiation when the current changes, and conservation of momentum is inherent in Maxwell's equations.
- One participant mentions that energy is consumed in overcoming radiation resistance, which affects momentum balance.
Areas of Agreement / Disagreement
Participants express varying degrees of skepticism about the original proposal, with some agreeing that it cannot work as described due to conservation laws, while others explore the nuances of the timing and effects involved. The discussion remains unresolved regarding the feasibility of achieving thrust without violating conservation principles.
Contextual Notes
Participants acknowledge issues with the timing of currents and the necessity of considering both positive and negative transitions in current to understand the forces involved. The discussion also highlights the complexities of EM radiation and its implications for momentum conservation.
