MLA Citation: Bloomfield, Louis A. "Question 258"
How Everything Works 17 Jul 2018. 17 Jul 2018 <http://howeverythingworks.org/print1.php?QNum=258>.
258. Why do north and south poles on magnets change back and forth?
Only electromagnets can change back and forth and then only when they are connected to a supply of alternating current. A permanent magnet, such as that used to hold notes to a refrigerator, has permanent poles that do not change. But an AC powered electromagnet, such as that found in a transformer, does have poles that change back and forth.

Return to HowEverythingWork.org
Generated for printing on Tuesday, July 17, 2018 at 13:39:08 EDT
Copyright 1997-2018 © Louis A. Bloomfield, All Rights Reserved
Privacy Policy