The discussion centers on the implications of time reversal symmetry in relation to magnetic fields and charges. It establishes that if time reversal symmetry is conserved, it implies the absence of a magnetic field, as the Lorentz force acting on a charge moving in a magnetic field disrupts this symmetry. Specifically, reversing the velocity of a charge does not allow it to retrace its path, indicating a break in time reversal symmetry. The conversation raises questions about alternative scenarios that could also lead to the breaking of this symmetry.
PREREQUISITESPhysicists, students of theoretical physics, and anyone interested in the foundational principles of electromagnetism and symmetry in physical laws.
JHamm said:Time reversal symmetry means that if you had recorded the situation and played the tape backwards things would "make sense" in that you could believe that was what really happened (watching some Brownian motion in reverse would make sense, watching a bowling ball slide back up the lane and then launch itself into your hand doesn't). So how do you think this applies to magnetic fields?