11. Both cards were demagnetized , said the manager, rounding up the usual suspects. 12. :Permanent magnets always demagnetize , it's just a matter of time. 13. Ferrite magnets are much more resistant to being demagnetized and are thus more robust. 14. The new card was demagnetized as well. 15. Magnetic media should also be kept away from magnetic sources, which could demagnetize them. 16. A manager checked my card and found the strip that stores electronic account information was demagnetized . 17. The current or magnetic field is then slowly reduced to zero, leaving the part demagnetized . 18. Yet another kind of remanence can be obtained by demagnetizing the saturation remanence in an ac field. 19. -- Cards can be stolen or demagnetized , leaving a consumer stranded without currency as a backup. 20. Where is the magnetization of the sphere and is called the demagnetizing factor and equals for a sphere.
