Final answer:
The most dominant speaker in the marketplace is the Dynamic speaker, which uses electromagnetic induction to turn electrical signals into sound by vibrating the cone to create small pressure changes in the air, generating sound waves.
Step-by-step explanation:
The most dominant type of speaker in the marketplace is the c) Dynamic speaker. Dynamic speakers operate on the principle of electromagnetic induction to convert electrical signals into sound. They are widely used because of their reliability, cost-effectiveness, and ability to produce a wide range of sounds suitable for most applications.
Regarding how sound is produced by an electronic speaker, b) The cone of a speaker vibrates to create small changes in the pressure of the air is the correct mechanism. As the electrical signal passes through the speaker's coil, it creates a magnetic field that interacts with a permanent magnet, causing the speaker cone to move. These movements produce pressure waves in the air, which we perceive as sound.