Yes, it’s another black hole question…
Let’s imagine a bar magnet falling toward a black hole. The bar magnet has your standard magnetic field around it; the kind you could visualize using a piece of paper and some iron filings. Let’s also assume a uncharged, nonspinning black hole with no other matter falling into it and no magnetic ‘charge’ either (no monopoles).
As the magnet approaches the event horizon, what happens to the shape of its magnetic field? Do the ‘lines of force’ reflect in some way? Are they compressed? Stretched toward the horizon? Is the magnetic field even aware of the event horizon?
As I understand it, as the magnet passes through the event horizon its magnetic field is snuffed out. From the black hole’s perspective, is there a difference between absorbing a bar magnet as opposed to a plain iron bar? Some infinitesimal difference in mass, perhaps?