School of Physics Lecture Demonstration Manual

Eh-6 Paramagnetism and Diamagnetism

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

Aim

To demonstrate paramagnetism and diamagnetism

Apparatus

Diagrams

Click on pictures to enlarge.

Paramag and Diamag Pic

Description

A cylindrical sample of Aluminium and Bismuth is suspended from a fine cotton thread so that the sample is located in an inhomogeneous magnetic field. A bell jar surrounds the apparatus to reduce the effect of disturbing air currents. When the magnetic field is applied the samples tend to orient themselves to minimise their potential energy. The diamagnetic material (Bismuth) will have an induced moment anti parallel to the field direction and will move toward a region of weaker field strength. The paramagnetic material (Aluminium) will have an induced moment parallel to the field direction and will move toward the region of stronger field strength at the tapered tip.

Safety notes

Electrical safety 

Maintenance 

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