Which of the following is not a component of electric bell?
  • A
    Gong
  • B
    Ferromagnetic strip
  • C
    Low magnetic field permanent magnet to attract ferromagnetic strip
  • D
    None of the above

Solution

Electric bell works on the mechanism of electromagnets i.e, temporary magnets, and no permanent magnet is used.
Temporary magnet allows the ferromagnetic strip to return back to its initial state as switch is released.