- The tape recorder which we use to listen songs or record voices works on the principle of electromagnetic induction.
- It consists of piece of plastic tape coated with iron oxide and is magnetised more in some parts than in others.
- When the tape is moved past as a small coil of wire (head of the tape recorder), the magnetic field produced by the tape changes, which leads to generation of current in the small coil of wire.
- This small current will be converted into sound by speaker of varying strengths.
- Thus the voice will be reproduced from the tape of a tape recorder.