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(B) The metal detector works on the principle of $LC$ resonance in $AC$ circuits.When a person walks through the metal detector,they pass through a la

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Resonance in $AC$ circuits

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(B) The metal detector works on the principle of $LC$ resonance in $AC$ circuits.When a person walks through the metal detector,they pass through a large coil that acts as an inductor.This coil is part of an $LC$ circuit tuned to a specific resonant frequency.The presence of a metal object changes the effective inductance of the coil,which in turn shifts the resonant frequency of the circuit.This shift causes the circuit to move out of resonance,leading to a significant change in the current flowing through the circuit.This change in current is detected by the electronic circuitry,which triggers an alarm sound.

At an airport,a person is made to walk through the doorway of a metal detector,for security reasons. If she/he is carrying anything made of metal,the metal detector emits a sound. On what principle does this detector work?

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