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Faraday Disk Dynamo Model
written by Anne Cox
The EJS Faraday Disk Dynamo shows a conducting disk that rotates in a magnetic field. This produces a current (homopolar generator) and for certain configurations, it is a self-exciting dynamo. A self-exciting dynamo is the mechanical analog of a proposed mechanism to produce the earth and sun's magnetic fields. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.

The Faraday Disk Dynamo model was created using the Easy Java Simulations (Ejs) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the ejs_em_FaradayDiskDynamo.jar file will run the program if Java is installed.  Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models.  Additional Ejs models are available.  They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Please note that this resource requires at least version 1.5 of Java (JRE).
1 source code document is available
Subjects Levels Resource Types
Electricity & Magnetism
- Electromagnetic Induction
= Induced Currents and Forces
= Motors and Generators
- Inductance
= LR Circuits
= RLC Circuits - DC
- Magnetic Fields and Forces
= Force on Moving Charges
= Magnetic Fields
- Lower Undergraduate
- Upper Undergraduate
- Instructional Material
= Activity
= Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
  • Currently 5.0/5

Rated 5.0 stars by 1 person

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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license. Additional information is available.
Rights Holder:
Wolfgang Christian
Java Archive File
Ejs, OSP, chaos, emf, induced current, nonlinear circuit
Record Cloner:
Metadata instance created September 3, 2009 by Anne Cox
Record Updated:
June 6, 2014 by Andreu Glasmann
Last Update
when Cataloged:
September 4, 2009
Other Collections:

any idea how to overcome this compiling error?

Author: lookang
Posted: October 23, 2009 at 6:58AM
Source: The Open Source Physics collection

D:\EasyJavaSimulation\EJS_4.2_090719\EJS_4.2\workspace\output\users\sgeducation\lookang\ejs_em_FaradayDiskDynamo\ unreachable statement
  public boolean _method_for_torque_editable () { return _isPaused();; }

» reply

Re: any idea how to overcome this compiling error?

Author: lookang

using the latest version

works now! thanks!

» reply

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ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
A. Cox, Computer Program FARADAY DISK DYNAMO MODEL, Version 1.0 (2009), WWW Document, (
A. Cox, Computer Program FARADAY DISK DYNAMO MODEL, Version 1.0 (2009), <>.
APA Format
Cox, A. (2009). Faraday Disk Dynamo Model (Version 1.0) [Computer software]. Retrieved June 15, 2024, from
Chicago Format
Cox, Anne. "Faraday Disk Dynamo Model." Version 1.0. (accessed 15 June 2024).
MLA Format
Cox, Anne. Faraday Disk Dynamo Model. Vers. 1.0. Computer software. 2009. Java (JRE) 1.5, Java Archive File.15 June 2024 <>.
BibTeX Export Format
@misc{ Author = "Anne Cox", Title = {Faraday Disk Dynamo Model}, Month = {September}, Year = {2009} }
Refer Export Format

%A Anne Cox %T Faraday Disk Dynamo Model %D September 4, 2009 %U %O 1.0 %O Java Archive File %O application/java %O Java Archive File

EndNote Export Format

%0 Computer Program %A Cox, Anne %D September 4, 2009 %T Faraday Disk Dynamo Model %7 1.0 %8 September 4, 2009 %9 Java Archive File %U

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The AIP Style presented is based on information from the AIP Style Manual.

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Faraday Disk Dynamo Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Faraday Disk Dynamo Model.

relation by Wolfgang Christian

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