A microphone changes sound into an electric wave. The movement of electric charge past the headâ€™s coil leads to the formation of magnetic fields on the surface of the tape. The units of current through the head determine the number of particles that are magnetized and the strength of the magnetic field created. The direction of movement of electric charges determines the polarization of the particles on the magnetic. When the tape is played the magnetized tape runs close to the head causing the formation of a small electric current in the headâ€™s coil by electromagnetic induction. The electric signal is sent to a speaker where it is changed to sound. Phonograph recordings are easily erased by strong magnetic fields. They are also relatively noisy and in lesser circulation as compared to compact disks (Kirkland 37).
Computer disks also use the notion of magnetism to store information. Nevertheless, computers store data in a two digit code known as the binary code. The code is written using zeros and or ones, each number constituting a measurement of information called a bit. Such data is known as digital data. Magnetic storage is suitable for storing trails of 1s or zeros. Each unit of data, a bit, is represented by a small magnet. The data preserved on CDs is written as arrangements of large number of magnetized poles. Eight bits constitute a unit of measurement known as byte in computer jargon; the carrying capacity of computer disks is stated in bytes.
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