Demos: 6D-03 Microphone

A permanent magnet is placed coaxially with a coil (the larger coil of 6D - 02). The latter is connected to a projectable microammeter. A circular iron disk is held on the end of the magnet and is so placed that the disk is inside the coil. When the plate is wiggled an induced current is registered by the ammeter.

Directions: Simply follow the description above.

Suggestions for Presentation: Discuss the effect of the iron disk on the magnetic field near the end of the magnet. What happens when the disk moves around in the field? How does this effect the status of the field inside the coil?

Applications: Microphone

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Last Updated: May 9, 2016 11:44 AM