Question

question 34

the speaker uses what type of magnets?
a. one permanent and one electromagnet
b. two permanents
c. two electromagnets
d. it does not use magnets

Explanation:

Identify the components of a dynamic speaker

Using the Speaker Physics knowledge point
A standard dynamic loudspeaker operates by interacting two magnetic fields to produce sound. It consists of a stationary permanent magnet that provides a constant, uniform magnetic field, and a movable voice coil (which acts as an electromagnet) attached to the speaker cone.

Analyze the interaction of the magnets

Using the Speaker Physics knowledge point
When an alternating electrical audio signal flows through the voice coil, it creates a rapidly changing magnetic field. This electromagnetic field interacts with the stable magnetic field of the permanent magnet, causing attractive and repulsive forces that move the cone back and forth to generate sound waves. Thus, the system requires exactly one permanent magnet and one electromagnet.

Answer:

• a. one permanent and one electromagnet (Correct answer)
• b. two permanents
• c. two electromagnets
• d. it does not use magnets