El-5 Visualisation of Electric Field Lines
Published: Tuesday 14 March 2006 - Updated: Thursday 31 March 2011
To demonstrate the electric field line configuration for various pairs of electrodes.
- Whimshurst machine
- Castor oil
- Prepared electrodes
- Glass tray
- Overhead projector
Click on pictures to enlarge.
The chosen electrode plate is placed in the shallow glass dish containing a mixture of semolina and castor oil. The electrodes are connected to the poles of the Whimshurst machine which produces a high D.C. potential. The unit is placed on the overhead projector.
The semolina aligns itself along the lines of the electric field. The electrode configurations available are,