Conceptualize: The operation of metal detectors is based upon the principles of electromagnetic induction. Metal detectors contain one or more inductor coils that are used to interact with metallic elements on the ground.
Analyze: Alexander graham bell invented the first crude metal detector in 1881. As president James Garfield lay dying of an assassin's bullet in 1881, hurriedly invented a metal detector in unsuccessful attempt to locate the fatal slug.
