If Magnets are involved in producing sound, whats the physics in recording them ? Do The compressions and rarefactions vibrate an object/coil that causes a changing mangnetic field which then records it onto tape ?
I should have googled it. My bad. Anywho, So the magnetic flux is recorded in the tape.. "During playback, the motion of the tape pulls a varying magnetic field across the gap. This creates a varying magnetic field in the core and therefore a signal in the coil. This signal is amplified to drive the speakers. " Is the tape generating a magnetic field ?, I thought it was inert ?
The tape is magnetized, like a permanent magnet. Or, more precisely, the tape contains thousands of tiny permanent magnets that were previously magnetised during recording. Pulling the tape past the tape head means pulling each tiny magnet past the head. Since the magnets don't all have the same strength, the magnetic field across the gap varies up and down, as stronger and weaker magnets go past.
Which then induces a current in a circuit somewhere, which becomes amplfied into the speakers, and what not... Cool.. This makes physics somewhat more bearable.