Chapter 25.1, Problem 12SSC

To determine

To Explain: The result when the diaphragm of a microphone is pushed in.

Explanation of Solution

Introduction:

Faraday’s law of electromagnetic induction states that when a conducting wire is kept in a magnetic field which is varying, an EMFis induced in the wire which leads to flow of current called induced current.

When the diaphragm moves because of sound vibrations, it moves the conducting coil attached to it. This coil is placed inside a magnet i.e. a magnetic field. When the diaphragm moves, the coil placed in the magnetic field also move, thereby inducing current in the wire. This is how sound wave is converted into an electrical signal in a microphone.

Conclusion:

When the diaphragm moves the coil placed in the magnetic field also move, thereby inducing current in the wire.