2006-09-24 02:47:18 · 5 answers · asked by sharon c 1 in Science & Mathematics ➔ Physics
A microphone uses the energy from sound waves to make a tiny current. This tiny current is passed through a little coil in the "recording head" of the tape recorder, and the tape passes underneath the recording head. Anytime electricity passes through this coil, no matter how tiny the electrical current is, it makes a MAGNETIC field around it. The stronger the current from the microphone, the stronger the MAGNETIC field. The tape is coated with little rust particles that pick up and HOLD the MAGNETIC field produced by the recording head.
All sound waves have a frequency and an amplitude. The frequency determines how fast the tiny current in the recording head changes, and the amplitude determines how strong the tiny current is. The "sound waves" recorded on tape are really just a record of how fast and how much the tiny current in the recording head was changing.
One simple analogy is to think of the MAGNETIC patterns stored on tape as footprints on a muddy trail. The deeper the footprint, the louder the sound wave. The space between the footprints determines the frequency of the sound wave.
:)
2006-09-24 03:33:41 · answer #1 · answered by Anonymous · 0⤊ 0⤋
A tape recorder uses an electro magnet which is varied with the sound being recorded to cause magnetic variations to be permanently left on the tape.
2006-09-24 09:53:15 · answer #2 · answered by rscanner 6 · 0⤊ 0⤋
Okay, its works a little something like this..
There are generally three magnets in a tape recorder.
One is the erase head. This is charged (electromagnet) as the tape is passed accross and is mucks up the alligned metal particals on the magnetic tape surface (ie the audio)
The other magnet is the recording head. This is only on (again electromagnet) as the tape passes across it and configures and aligns the filaments in the magnetic tape.
The pickup playback head could be considered as a third magnet I guess.
2006-09-24 10:21:14 · answer #3 · answered by bagpuss_kicks_arse 2 · 1⤊ 0⤋
Magnet is used in the speakers of the tape recorders.
2006-09-24 09:56:00 · answer #4 · answered by Akki 1 · 0⤊ 1⤋
magnet is used to convert/record the sound energy into magnetic lines on a magnetised tape and also to play back what has been recorded by converting magnetic energy to sound energy
2006-09-24 09:54:41 · answer #5 · answered by raj 7 · 0⤊ 0⤋