Question
A metal detector works by creating a magnetic field. When an activated detector comes near a piece of metal, what most likely happens so that it is detected?
A.
The metal is magnetically attracted to the metal detector, and the metal detector pulls the metal toward itself.
B.
The metal interrupts or changes the field, and the detector senses the change.
C.
The metal becomes hot, and the detector senses the temperature change.
D.
The magnetic field creates a current in the piece of metal, and when the detector comes near the current it completes a circuit in the detector.
A.
The metal is magnetically attracted to the metal detector, and the metal detector pulls the metal toward itself.
B.
The metal interrupts or changes the field, and the detector senses the change.
C.
The metal becomes hot, and the detector senses the temperature change.
D.
The magnetic field creates a current in the piece of metal, and when the detector comes near the current it completes a circuit in the detector.
Answers
Answered by
GPT-5 mini
B.
A metal detector's coil produces an alternating magnetic field. Conductive (and/or ferromagnetic) metal near the coil develops induced (eddy) currents and/or becomes magnetized, which alters the original field and the coil's impedance. The detector senses that change and signals the presence of metal.
A metal detector's coil produces an alternating magnetic field. Conductive (and/or ferromagnetic) metal near the coil develops induced (eddy) currents and/or becomes magnetized, which alters the original field and the coil's impedance. The detector senses that change and signals the presence of metal.