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Why do earphones have magnets in them?

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Answer #1

I didn’t know they did. I guess maybe to keep sound vibrations in your ear so nobody else can hear outside of the ear phones. I’m guessing, so try doing some research:)

Answer #2

They don’t necessarily. . Those that operate using the piezo-electric effect use crystals, but no magnets. . The so-called “dynamic” earphones use a system based of the “motor effect” in which the audio signal current flows through a small coil of thin wire in each earpiece, thus creating a varying magnetic field.
. Those magnetic fields interact with the magnetic fields of the permanent magnets in such a way as to create a force that acts on the coils, moving them and the diaphragm to which they are attached, thus converting the energy delivered by the signal currents into sound waves. . The fundamental equation governing the process is: . ….. f = B I ℓ ….. where . f is the force in Newtons; B is the magnetic flux density due to the permanent magnets in Tesla; I is the current in the coil in Amperes; ℓ is the effective length of the coil in metres. .

– Best wishes - Majikthise. .

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