# Why isn't EM radiation from an accelerated charge time reversible?

Let a charge $$q$$ enter a constant magnetic field $$B$$ at 90 degrees, hence radiating EM energy-momentum and spiraling inwards to some point as it slows down. Time reversing this, including the current generating the magnetic field so it now becomes $$-B$$, the charge still radiates outgoing EM radiation and spiral inwards. All the events are reversed compared to the original case, so why isn't the EM radiation and spiraling reversed?

• it is reversible, by highly unlike due to the second law of thermodynamics. It is very difficult in general to find initial conditions that will result in the effect you mention – Wolphram jonny Jan 31 at 22:16