Question

in a speaker, to what is the electromagnet attached?
a. current
b. cone
c. permanent magnet
d. coil

Explanation:

Identify speaker components

Using the Speaker Physics knowledge point
A dynamic speaker consists of a permanent magnet, an electromagnet (voice coil), and a diaphragm (cone).

Determine the physical attachment

Using the Speaker Physics knowledge point
The voice coil (electromagnet) is physically attached directly to the flexible speaker cone. When alternating current flows through the coil, the magnetic interaction with the permanent magnet causes the coil—and thus the attached cone—to vibrate, producing sound waves.

Answer:

• a. current
• b. cone (Correct answer)
• c. permanent magnet
• d. coil