How to prevent mobile phones from being detected by metal detectors?
There are two detectors, one is the signal detector, the other is a metal detector. I think your school uses a signal detector, because metal detectors ring whenever they have metal, such as iron belt buckles. If it's a signal detector, you don't want your cell phone to send out a signal. Shut down, absolutely can not find out. My school is using the signal, I did not find out the shutdown.
It's almost impossible to escape! At present, the metal detectors used by the provinces are using the principle of electromagnetic induction, the use of alternating current through the coil, to produce a rapid change in the magnetic field. The magnetic field can induce eddy currents in metal objects. Eddy currents also produce a magnetic field, which, in turn, affects the original magnetic field, causing the detector to emit a song. So, as long as the electronic device contains metal material can be detected!
