  Teaching electromagnetism by demonstrating a practical application associated
with learning content is an important teaching technique. Demonstrations are
often performed through video-assisted procedures, and are usually limited to a
one-to-one correspondence between the application and the learning content.
However, understanding of practical applications frequently requires
understanding of learning content beyond the ones studied in electromagnetism.
I designed a process to teach the working principles of cryogen-free
superconducting magnets. Understanding of this practical application requires
students to have knowledge of learning content from the disciplines of
electromagnetism and solid state physics. The teaching process involved the use
of homemade videos demonstrating magnet operation, which was combined with a
flipped classroom and an active learning approach.
