It has a transmission coil that creates a electromagnetic field via a high frequency alternating current. when in close proximity to metal a current is induced into the metal that produces an electromagnetic field. The metal detector has a receiving coil that gets an alternating current induced from the ...
from Google Alert - metal detectorhttps://www.google.com/url?rct=j&sa=t&url=http://www.fixya.com/support/t26947020-working_principle_metal_detector&ct=ga&cd=CAIyGjBmN2Y1NDMwZGU1NzA5Mzc6Y29tOmVuOlVT&usg=AFQjCNENoPPCwnkYTX6GjdU9W70oy-rmpQ
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