Does an Electron's Increased B Field Exist Outside a Black Hole's Event Horizon?

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SUMMARY

The discussion centers on the behavior of an electron's magnetic field (B field) as it crosses the event horizon of a black hole. It is established that any increase in the electron's B field does not exist outside the event horizon. Changes in electrical and magnetic fields propagate at the speed of light, and once the electron crosses the horizon, no part of its future lightcone extends beyond it. Thus, the effects of the electron's motion remain confined within the black hole.

PREREQUISITES
  • Understanding of black hole physics and event horizons
  • Knowledge of electromagnetic field theory
  • Familiarity with the concept of lightcones in spacetime
  • Basic principles of relativistic physics
NEXT STEPS
  • Research the properties of black holes and event horizons
  • Study electromagnetic field behavior in relativistic contexts
  • Explore the concept of lightcones and their implications in general relativity
  • Investigate the effects of particle motion near black holes
USEFUL FOR

Physicists, astrophysicists, and students studying general relativity and electromagnetic theory will benefit from this discussion.

cragar
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Lets say an electron crosses the event horizon of a black hole.
Now as it starts speeding up when it gets closer to the center of the black hole
its B field will increase. Does this increased B field exist outside the event horizon?
 
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cragar said:
Lets say an electron crosses the event horizon of a black hole.
Now as it starts speeding up when it gets closer to the center of the black hole
its B field will increase. Does this increased B field exist outside the event horizon?

No. Changes in electrical and magnetic fields propagate at the speed of light, and even light cannot cross the horizon outwards. Equivalently, all the effects of the electron's motion are in its future lightcone, and after the electron crosses the horizon no part of that lightcone lies outside the horizon.
 

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