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  4. When you walk through a metal detector carrying a metal object in your pocket, it raises an alarm. This phenomenon works on

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Q. When you walk through a metal detector carrying a metal object in your pocket, it raises an alarm. This phenomenon works on

JEE MainJEE Main 2022Alternating Current

Solution:

Metal detector works on the principle of transmitting an electromagnetic signal and analyses a return signal from the target. So it works on the principle of resonance in $AC$ circuit.