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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An $AC$ circuit consists of an inductor of inductance $0.5 \, H$ and a capacitor of capacitance $8 \, \mu F$ in series. The current in the circuit is maximum when the angular frequency of the $AC$ source is

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