loudspeakers

• how does a moving-coil loudspeaker produce a sound wave?

  • current creates a magnetic field around the coil
  • this interacts with the permanent magnetic field
  • this produces a resultant force causing the coil to move
  • when the direction of the current reverses the direction of the resultant force reverses
  • this causes the cone to vibrate, causing air particles to vibrate at the same frequency
  • this produces a sound wave