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edited by Andrew Graham
published by the Physics Instructional Resource Association

Tap-l, the Teaching APparatus List, is the email listserv for the Physics Instructional Resource Association. The discussions focus mostly on demonstrations of physical phenomena, such as might be used in classes. Topics also include equipment and materials for creating demonstrations or use in laboratories.

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General Physics - Curriculum - General	- Lower Undergraduate - Upper Undergraduate	- Instructional Material = Laboratory = Lecture/Presentation - Service

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Keywords:: PIRA, equipment, physics demonstrations
Record Creator:: Metadata instance created February 4, 2004 by Bruce Mason
Record Updated:: August 30, 2006 by Bruce Mason

Magnetic Deflection Demo Supplies

Author: Wayne Ernst
Posted: April 20, 2026 at 4:21PM

Hi, folks,

I am trying to acquire equipment that demonstrates the Lorentz force with magnetic deflection. At previous places, I have had a cathode ray tube with some kind of card that gets illuminated by a beam, and then approaching with a decently-strong magnet with one pole versus another, it is very apparent that the beam bends one way for one pole, and the opposite for the other pole, just as predicted.

Trouble is, I'm at a new place, and I do not have a cathode ray tube or any other apparatus for this specific demo. While I could use a video, I'm of the mind that if I can actually demonstrate the basic effects live, they are much more powerful and stick in the mind better than just showing a video. The double-trouble is that my budget is really limited year-to-year, and I have to be really careful prioritizing what equipment I request, in what order by priority, each year as I try and revamp the overall supplies in the lab closet.

I tried searching for the kinds of models I had at prior places, and found some candidates or look-alikes. If relevant, I am in the US:

https://www.eiscolabs.com/products/ph1216 (discontinued, but looks most similar to what I used to use)

https://klingereducational.com/products/kscimdeb-klinger-scientific-magnetic-deflection-of-an-electron-beam

https://www.haines.com.au/cathode-ray-tube-magnetic-effect.html

Does anyone know of a similar apparatus that could be had for similar prices or, preferably, cheaper? I am not looking to make sensitive measurements such as a charge-to-mass ratio kind of experiment, just basic a basic illustration of the right-hand rule with actual equipment as opposed to relying only on video.

Thanks in advance for any replies!

Sincerely,

Wayne

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