To reproduce the recording, the sound carrier with the phonogram is set in motion relative to the reproducing magnetic head at the same speed as during recording. The external magnetic flux of the tape passes through the magnetic head, inducing an EMF in it, which is a recorded signal in electrical form. This signal is amplified and sent to a loudspeaker.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.