in our ham classes it's very easy to explain dynamic mics...
it is just a speaker !!! so if you apply a bias voltage it will try to push the dynamic element ( speaker cone) in or out & HOLD IT !!!! making it difficult for audio to create an AC alternating current on that same , (now DC biased) voice coil.
Many a speaker has been forced into service as a microphone, and is a frequent design element as both in an intercom.
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