College of Liberal Arts & Sciences
5H30.15 - Electrostatic Deflection of Electron Beam
One power supply generates the electron beam. With the other you create an electrostatic potential that bends the beam. After you deflect the electron beam electrostatically you can bend it back to a straight line electromagnetically if desired.
Assembly with the Helmholtz coils is as observed and according to the circuit diagrams.
- Jonathan Mitschele, "Demonstrating the Sign of a Static Charge Using an Inexpensive Oscilloscope", TPT, Vol. 48, # 6, Sept. 2010, p. 431.
- Robert Ehrlich, "9.5, Magnetic Field of a Dipole", Why Toast Lands Jelly-Side Down, p. 150.
- W. Bolton, "The Action of Electric and Magnetic Fields on a Beam of Electrons", Book 4 - Electricity, Physics Experiments and Projects, 1968, p. 45-47.
Disclaimer: These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.