Sunday, August 5, 2018

general relativity - Why does the electric field escape a black hole?



An (unlikely) charged black hole can be described with the mass, angular momentum, charge and the thermal radiation. The reasoning behind the thermal radiation rests on the particle creation outside of the event horizon. What is the reasoning behind the escape of the electric field beyond the event horizon?





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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...