Question

in a speaker, when the electromagnet has a south polarity, it is repelled from the permanent magnet.
true
false

Explanation:

Analyze speaker magnetic interaction

Using the Speaker Physics and Magnetic Poles Law knowledge points

• A speaker operates by passing alternating current through a voice coil (electromagnet) placed within the magnetic field of a stationary permanent magnet.
• The interaction between the electromagnet and the permanent magnet produces an attractive or repulsive force depending on the instantaneous magnetic polarity of the electromagnet.
• Whether a south polarity electromagnet is repelled or attracted depends entirely on which pole of the permanent magnet it is facing.
• If the electromagnet faces the south pole of the permanent magnet, it is repelled; if it faces the north pole, it is attracted.
• Therefore, stating unconditionally that a south polarity electromagnet is repelled from the permanent magnet is false.

Answer:

• True
• False (Correct answer)