How anti-theft tags work - magnetostriction
Nov 29, 2015
Anti-theft tags contain a tiny mechanical oscillator that is activated by a magnetic field. The detectors at a shop's doorway can detect the oscillation magnetically. The tag can be activated and deactivated by magnetizing or demagnetizing it, respectively.
Special thanks for your support:
(better credits titlescreen in the next video!)
Support Applied Science: https://www.patreon.com/AppliedScience