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Code Number: 5H30.20
Demo Title: e/m - Electromagnetic Deflection of Electron Beam - Small
Condition: Excellent
Principle: Measure e/m of Electrons
Area of Study: Electricity & Magnetism
Equipment:
Electron beam deflection tube, 12 V DC power supply, 5 kV DC power supply (2), Helmholtz coils, old black and white or color TV, horseshoe magnets or large neodymium magnets.
Procedure:
Assemble the apparatus as shown and according to the diagrams enclosed. Trying this before class for practice is a very good idea. The small apparatus which will show only a 90 degree bend at best because of the small diameter of the Helmholtz coils.
References:
- Michel Glascock, M. Sparlin, "Thomson's e/m Experiment Revisited", AJP, Vol. 40, # 11, Nov. 1972, p. 6631.
- Ei-18: Freier and Anderson, A Demonstration Handbook for Physics.
- 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.