Astronomers have found that the magnetic field strengths near supermassive black holes can be as strong as their intense gravitational fields. In fact, these magnetic fields are able to expel material from the vicinity of the black hole to form highly energetic outflows called 'jets'.

Since black holes are so massive that not even light can escape, and since photons, the particles of light, are the carriers of the electromagnetic force, how is it that black holes can have magnetic fields?