Demos: 6D-06 Search Coil

A small coil having a large number of turns is attached at the end of a handle. The leads are connected to a projectable microammeter. When the coil is placed between the poles of a horn magnet and rapidly pulled out, a deflection of the ammeter is observed.

Directions: Connect the leads to the ammeter and focus its scale on the screen. Place the coil in the field so that the plane of the coil is perpendicular to the field lines and is centered between the poles of the magnet. Pull the coil out rapidly. Repeat, pulling the coil at different rates.

Suggestions for Presentation: Focus the discussion on the various ways in which the magnetic flux through the plane of the coil can be changed. E.g. the field can change through a fixed coil, the coil may be moved through a fixed field, etc. In this case the field remains fixed and the coil is moved. Compare this with the Demo 6D - 04.

Applications: A rotating coil of this type is used in magnetometers to detect and measure the strength of the magnetic field.

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Last Updated: May 9, 2016 11:44 AM