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Talking about charges. If someone claims that in his work time reversal symmetry is conserved, does that equal to say he/she is not imposing a magnetic field?
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 in to your hand doesn't). So how do you think this applies to magnetic fields?