I. Metal detectors function on two concepts of electricity and magnetism to detect the presence of metals.
II. There are different types of metal detectors such as beat frequency oscillation, very low-frequency detectors, pulse induction, and industrial metal detectors.
III. Metal detectors are used to find hidden metal objects or objects buried underground.
IV. They are also used for various purposes such as land mine detection, geological detection, airport and building security; it is also used in the construction industry to identify the steel bars within reinforced concrete.
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