Abstract:
A method to construct an apparatus for measuring the alternating magnetic field was
described. The measuring principle of a constructed apparatus is based on the Faraday's
law of induction. The apparatus consists of two coils: a large field coil was designed to
produce a magnetic field and a tiny search coil acts as a probe for measuring that field
by the voltage induced in a tiny search coil. By measuring the induced voltages
occurred in the search coil, the magnetic field in the field coil can be calculated. From
Faraday's law of induction, induced electromotive force is given by
The apparatus gives the satisfactory result with the error is
less than 10%. This simple apparatus is capable of showing the magnetic field
phenomena, Faraday's law and Biot-Savart law. Therefore, it is suitable for visual
display to demonstrate students in front of the classroom.