An emf is induced in a conductor moving in a magnetic field; a current-carrying conductor placed in a magnetic field experiences a force, causing it to move. These principles are at work in generators, where mechanical energy is transformed into electrical energy, and in motors, where electrical energy is transformed into mechanical energy. And the same principles apply to loudspeakers, in which electrical energy is transformed into mechanical energy, and to microphones, where mechanical energy is transformed into electrical energy.
At the heart of many microphones and loudspeakers is a coil of wire and a permanent magnet. This is also true for motors and generators. So, could a motor (or generator) function as a loudspeaker speaker or microphone? Could sound waves incident on the coil/magnet system of a motor result in a detectable electrical signal? Or, if an audio frequency electrical signal is input into a motor, could that result...