What happens to the magnetic field of a star that collapses completely to become a black hole?
A) The magnetic field becomes infinitely intensified.
B) The magnetic field must be radiated away; black holes never have magnetic fields.
C) The magnetic field becomes compressed and intensified by a factor equal to the ratio of the star's original diameter to the diameter of the event horizon.
D) The magnetic field becomes weaker by the ratio of the diameter of the black hole event horizon to the star's original diameter.

Question

Quizplus · Accepted Answer

Black holes are defined by their mass, charge, and angular momentum, with no other characteristics, according to the no-hair theorem. This means any magnetic field must be radiated away as the star collapses into a black hole.

What Happens to the Magnetic Field of a Star That