Question

superconducting magnets are used in machines called particle - accelerators. these machines rely on zero resistance in order to function properly. how are the magnets able to have zero resistance? they are heated to extremely high temperatures. they are cooled to extremely low temperatures. they are made to be very thick. they are made to be very thin.

Explanation:

Superconducting magnets used in particle accelerators rely on zero - resistance. This is achieved by cooling them to extremely low temperatures, which allows them to maintain their superconducting state.

Answer:

They are cooled to extremely low temperatures.