School of Physics Lecture Demonstration Manual

Ea-4 Magnetic Field at the Centre of Coil

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


To Demostrate the properties of a magnetic field in a coil of wire.



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Magnetic Field At The Centre Of A Coil

Mag Field at Centre of Coil Diagram


Magnetic Field At The Centre Of A Coil


The magnetic field strength at the centre of a circular current may be demonstrated by applying various D.C. currents to the coil. The direction of the field is always along the axis and the strength may be shown by the period of oscillation of the compass needle.

Safety notes

Electrical safety 


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