Question

How can the energy of a spinning black hole be converted into magnetic field?

Answer 1

I've read about the Blandford-Znajek process, and what I understood is that the black hole is treated as if it were a conducting sphere spinning rapidly with an accretion disk around it, and the rotational energy of the black hole would be extracted and converted into a strong magnetic field around the black hole.

Answer 2

The wave transports energy along the magnetic field lines outward, causing the total energy of the plasma near the hole to decrease to negative values. When this negative energy plasma enters the horizon, the rotational energy of the black hole decreases. Through this process, the energy of the spinning black hole is extracted magnetically

HOPE IT HELPS ✌