Demos: 6D-15 Inductor Radio
Two separate coiled conducting loops are used in this demonstration. One loop is connected to a radio tuned to a station. The other loop is connected to a speaker. The loop connected to the radio will transmit a signal that induces a magnetic field created by the current in the loop. The signal is received in the speaker loop which induces an electric current in the wire which will drive the speaker and emit the sound.
Directions for doing the demo: Align the two conducting loops and turn on the radio. Alter the distance between the loops which will vary the intensity of the sound.
Suggestions for Presentation: Discuss the role of magnetic flux and how it must be perpendicular to the conducting loop for the maximum effect. Slowly rotate the speaker loop until it is perpendicular showing that the sound intensity diminishes completely.
Applications: Faradays Law,Electromagnetic Waves