Question

the polarity of the field in a speaker is determined by the direction of current flow.
true
false

Explanation:

Analyze the speaker electromagnet

Using the Speaker Physics and Electromagnetism knowledge points

• A dynamic speaker contains a voice coil placed within the magnetic field of a permanent magnet.
• The voice coil acts as an electromagnet when current passes through it.
• The magnetic polarity (North and South poles) of this electromagnet is determined by the direction of the current flowing through the coil.
• Reversing the current direction reverses the magnetic poles, causing the coil to alternate between attraction and repulsion, which vibrates the cone to produce sound.
• Therefore, the statement is true.

Answer:

• True (Correct answer)
• False