Rickenbacker 360 12 A electric guitar pickup is basically just like an energetic mike coil. For decades, dynamic microphones have now been sent with the style coil attached to the principal of the microphone's transformer, and maybe not introduced to surface (‘floating'). The microphone's situation is typically attached to the cable guard, that will be connected to the mike amplifier's surface (see Rane's site for more discussion).
By and large, dynamic microphones are very quiet devices consequently of the mix of transformer isolation and balanced, flying sign lines for the duration of, along with guarded, humbucking coils.
So why don't you instruments? Guitars are notoriously affected by noise. Humbucking pickups are only a partial (though important!) solution. Well-known answer is always to move practicing the guitar pickup to a healthy output, just like a microphone. The same strategy was printed this 2001 patent software like this Rickenbacker 360 12?