The Falling Bar in a Magnetic Field model displays the non-uniform motion of a conducting bar as it slides along a vertical U shaped wire with resistance R. The apparatus is imbedded in a magnetic field that is B perpendicular to the plane of the bar. The Faraday-Neumann-Lenz law for electromagnetic induction produces a motional emf and an electric current that interacts with the external field. The motion of the bar shows that the bar's velocity exponentially approaches a terminal value.
The Falling Bar in a Magnetic Field model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double click the jar file to run the program if Java is installed.
Please note that this resource requires
at least version 1.5 of Java (JRE).
Falling Bar in a B Field Description
Motion of a conducting bar in an uniform magnetic field description. download 60kb .pdf
Last Modified: April 28, 2021
A. Pisani, Computer Program FALLING BAR IN A B FIELD MODEL, Version 1.0 (2021), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=15581&DocID=5436).
A. Pisani, Computer Program FALLING BAR IN A B FIELD MODEL, Version 1.0 (2021), <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=15581&DocID=5436>.
Pisani, A. (2021). Falling Bar in a B Field Model (Version 1.0) [Computer software]. Retrieved April 27, 2025, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=15581&DocID=5436
Pisani, Armando. "Falling Bar in a B Field Model." Version 1.0. https://www.compadre.org/Repository/document/ServeFile.cfm?ID=15581&DocID=5436 (accessed 27 April 2025).
Pisani, Armando. Falling Bar in a B Field Model. Vers. 1.0. Computer software. 2021. Java (JRE) 1.5. 27 Apr. 2025 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=15581&DocID=5436>.
%A Armando Pisani %T Falling Bar in a B Field Model %D April 28, 2021 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=15581&DocID=5436 %O 1.0 %O application/java
%0 Computer Program %A Pisani, Armando %D April 28, 2021 %T Falling Bar in a B Field Model %7 1.0 %8 April 28, 2021 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=15581&DocID=5436
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