Detecting Magnets With a Metal Detector

Most recent answer: 09/21/2013

Why does a metal detector not find a magnet
- stacey (age 20)

Metal detectors rely on eddy currents that are induced in metals by a coil driven by a radio frequency oscillator.   These induced currents in turn produce a small magnetic field that can be sensed.  Metalic magnets made of iron or iron alloyed with neodymium or cobalt have large conductivities and should be easily sensed.   Ceramic-ferrite magnets on the other hand have almost no conductivity and thus won't show up.    You might try an experiment using both types.  Tell us your result.



(published on 09/21/2013)