Question 94 of 190
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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Answer: (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 circuit.
When the LC circuit detects any resonating frequency from any metal which is near to it, electric field will be created which will lead to induces current in the coil and changes in the signal flow through the coil.
When the LC circuit detects any resonating frequency from any metal which is near to it, electric field will be created which will lead to induces current in the coil and changes in the signal flow through the coil.