What happens during a quench in a superconductive magnet?

During a quench in a superconductive magnet, the coil's temperature rises, causing the superconducting material to lose its ability to conduct electricity without resistance. This transition from a superconductive state to a resistive state leads to the windings of the magnet becoming resistive. As electrical current continues to flow through these resistive windings, they produce heat due to electrical resistance. This excessive heat can result in further degradation of the superconductive material and potentially damage the magnet system if not managed properly.

The other options do not accurately describe the events that occur during a quench. For instance, the coil temperature does not remain stable; instead, it increases significantly. The notion of generating additional electrical power is contrary to the nature of a quench as the system is primarily trying to dissipate energy, not amplify it. Additionally, the magnetic field strength does not increase. In fact, a quench leads to a decrease in the magnetic field due to the loss of superconductivity.