Sunita and her fr

Answer :

(a) A metal detector works on the principle of resonance in an AC circuit.

(b)A metal detector has an AC circuit tuned to resonance condition. When a person carrying any metal walks through the gate of a metal detector, the impedance of the circuit changes. This results in a significant change in current which is immediately detected and the alarming sound is emitted.

(c) Sunita has a scientific temperament. She is knowledgeable and a responsible citizen.

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