School of Physics Lecture Demonstration Manual

Ea-3 Faraday's Rotating Wire

Published: Tuesday 14 March 2006 - Updated: Tuesday 29 March 2011


To demonstrate the force on a current carrying conductor in a magnetic field by way of Faraday's original rotating wire experiment.



Click on pictures to enlarge.

Faradays Rotating Wire Diagram 1

Faradays Rotating Wire Diagram 2


Faraday's Rotating Wire (1)

Faraday's Rotating Wire (2)


The apparatus is connected as shown in the diagram. Mercury is poured into the plastic cup at the base, and the D.C. supply set to 12 Volts. The rheostat is then adjusted to the maximum resistance and reduced until rotation of the wire follows.

Safety notes

Electrical Safety 

Chemical Safety 


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