An example is superconducting magnets that can produce magnetic fields in excess of 20 tesla (about 500 times stronger than a typical refrigerator magnet).

• 可以产生强度超过20特士拉的磁场的超导磁铁，就是一个例子（磁力约为一般贴在冰箱门上小磁铁的500倍）。