July 01, 2009 Filed in: Demo Corner
Dave Doucette (OAPT President) Richmond Hill High School, Richmond Hill, Ontario
Several years ago I was in need of a cheap, easily assembled, sensitive magnetometer. The intent was to design a tool for students to palpably observe the magnetic field around a current carrying conductor. Deflection of a compass needle lacked the ‘wow factor’ I sought. The solution turned out to be beautiful in its simplicity. Read More...
September 01, 2006 Filed in: Demo Corner
Leigh Palmer, Simon Fraser University
Here's a demonstration that will make your students think more carefully about the meanings of the terms voltage, electromotive force, and potential difference. A transformer is necessary for the demonstration. Read More...
March 01, 2006 Filed in: Demo Corner
John Pitre, University of Toronto
In the December 2004 issue of The Physics Teacher
, Christopher Chiaverina described a motor consisting of four components: a battery, a cylindrical rare earth magnet, a small piece of copper wire, and a steel nail. Since I know that many of our members do not have ready access to this journal, I have essentially reproduced his article here. Read More...
January 01, 2001 Filed in: Demo Corner
Peter Scovil, Waterford, ON
I like music, and enjoy playing the guitar, so the following demo caught my eye (or ear?). It was in the Jan. '95 issue of The Physics Teacher
(p.58) by G.R. Davies of South Africa. It is a good example of electromagnetic induction that is easy for students to understand. Read More...
June 01, 1998 Filed in: Demo Corner
John M. Pitre, Department of Physics, University of Toronto
In the January 1997 issue of The Physics Teacher
, two articles appeared detailing the use of rare earth magnets to demonstrate Lenz’s Law in the classroom. The principle involved is that a permanent magnet falling through a tubular conductor will induce a current in the conductor and hence a magnetic field which will oppose the magnetic field of the permanent magnet and thus slow its rate of fall. This article gives variations of the methods discussed in those papers. Read More...
June 01, 1997 Filed in: Demo Corner
Alan Hirsch, Port Credit SS, Mississauga
What physics toy have you seen that can attract the attention of every passerby in a mall during the December shopping rush? And what toy can you expect your physics students to exclaim “hey, cool” when they see it? The answer to each of these questions is the same: The Levitron
: The Amazing Antigravity Top. Read More...
November 01, 1995 Filed in: Demo Corner
John Childs, Grenville Christian College, Brockville
Two demonstrations from John Childs. Read More...
March 01, 1994 Filed in: Demo Corner
John Earnshaw, Trent University
The author presents three demonstrations: a large pendulum, the centre of mass of a person, and the magnetic force on a beam of electrons. Read More...
March 01, 1991 Filed in: Demo Corner
Frank Allan, Science Co-ordinator, Ottawa Board of Education
The world’s simplest speaker can be constructed in a matter of seconds. Read More...
December 01, 1990 Filed in: Demo Corner
Robert Ehrlich, Physics Department, George Mason University
The world's simplest motor can be constructed in less than five minutes. Read More...
December 01, 1989 Filed in: Demo Corner
Peter Scovil, Waterford District High School
Have you had difficulties explaining to students the complexities of the D.C. motor? Read More...