Superconducting magnets are used in machines called particle accelerators. These machines rely on zero resistance in order to function properly.

Question

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.

Answer 1

Superconducting magnets achieve zero resistance by being cooled to extremely low temperatures. When certain materials are cooled below their critical temperature, they enter a superconducting state where they exhibit zero electrical resistance. Thus, the correct answer is:

They are cooled to extremely low temperatures.