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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 |
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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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