1.

When you walk through a metal detector carrying a metal object in your pocket, it raises an alarm. This phenomenon works on (A) Electromagnetic induction(B) Resonance in ac circuits(C) Mutual induction in ac circuits(D) interference of electromagnetic waves

Answer»

Correct option is (B) Resonance in ac circuits

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.



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