Question

Why is magnet placed in a speaker

Answer 1

For speakers to produce sound, they need to create audible mechanical vibrations in the air. That means they need something that can vibrate quickly when hit by electric signals. The vibrating item in a magnetic speaker is a diaphragm (or cone). The diaphragm is a conical structure made up of a flexible material. When driven by a magnetic force, the diaphragm vibrates.
It’s attached to a coil placed near the magnet, to make it vibrate when an electric current passes through it.
The magnet allows the speakers to create mechanical vibrations (sound) by allowing the electric signals to interact with the magnetic field. When the electric signal going through the voice coil changes its direction, it creates a polar movement between the magnet and the speaker.

The magnet helps to create a magnetic field that creates sound vibrations when hit by electric signals. The signals cause fluctuations in the opposing magnetic forces between the magnet and the coil, making it move back and forth