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Point Charge Electric Field in 1D Model
written by Andrew Duffy
The Point Charge Electric Field in 1D model investigates the electric field at various positions along a line, when there are either one or two charged particles on that line. The electric field is represented in two ways. First, there is a movable positive test charge that you can move along the line to sample the field at various locations - the direction of the force on that test charge is the same as the direction of the electric force on the test charge.

The second way to represent the electric field is to plot a graph of the electric field as a function of position. For the graph, we define positive field as a field pointing to the right, and negative field as a field pointing to the left.
1 supplemental document is available
1 source code document is available
Subjects Levels Resource Types
Electricity & Magnetism
- Electric Fields and Potential
= Electric Field
- Electrostatics
= Coulomb's Law
- Lower Undergraduate
- High School
- Middle School
- Upper Undergraduate
- Instructional Material
= Interactive Simulation
- Audio/Visual
= Movie/Animation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
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Access Rights:
Free access
This material is released under a GNU General Public License Version 3 license.
Rights Holder:
Andrew Duffy, Boston University
EJS, Easy Java Simulation, charge, charge particles, coulomb's law, electric, electric field, electric field simulation, field
Record Cloner:
Metadata instance created September 2, 2009 by Elijah Lee
Record Updated:
June 13, 2014 by Andreu Glasmann
Last Update
when Cataloged:
August 27, 2009
Other Collections:

AAAS Benchmark Alignments (2008 Version)

11. Common Themes

11B. Models
  • 6-8: 11B/M1. Models are often used to think about processes that happen too slowly, too quickly, or on too small a scale to observe directly. They are also used for processes that are too vast, too complex, or too dangerous to study.

AAAS Benchmark Alignments (1993 Version)


G. Forces of Nature
  • 4G (9-12) #3.  There are two kinds of charges?positive and negative. Like charges repel one another, opposite charges attract. In materials, there are almost exactly equal proportions of positive and negative charges, making the materials as a whole electrically neutral. Negative charges, being associated with electrons, are far more mobile in materials than positive charges are. A very small excess or deficit of negative charges in a material produces noticeable electric forces.
  • 4G (9-12) #4.  Different kinds of materials respond differently to electric forces. In conducting materials such as metals, electric charges flow easily, whereas in insulating materials such as glass, they can move hardly at all. At very low temperatures, some materials become superconductors and offer no resistance to the flow of current. In between these extremes, semiconducting materials differ greatly in how well they conduct, depending on their exact composition.


B. Models
  • 11B (9-12) #1.  The basic idea of mathematical modeling is to find a mathematical relationship that behaves in the same ways as the objects or processes under investigation. A mathematical model may give insight about how something really works or may fit observations very well without any intuitive meaning.

NSES Content Standards

Con.B: Physical Science
  • 9-12: Motions & Forces
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Record Link
AIP Format
A. Duffy, Computer Program POINT CHARGE ELECTRIC FIELD IN 1D MODEL (2008), WWW Document, (
A. Duffy, Computer Program POINT CHARGE ELECTRIC FIELD IN 1D MODEL (2008), <>.
APA Format
Duffy, A. (2008). Point Charge Electric Field in 1D Model [Computer software]. Retrieved March 24, 2018, from
Chicago Format
Duffy, Andrew. "Point Charge Electric Field in 1D Model." (accessed 24 March 2018).
MLA Format
Duffy, Andrew. Point Charge Electric Field in 1D Model. Computer software. 2008. 24 Mar. 2018 <>.
BibTeX Export Format
@misc{ Author = "Andrew Duffy", Title = {Point Charge Electric Field in 1D Model}, Month = {August}, Year = {2009} }
Refer Export Format

%A Andrew Duffy
%T Point Charge Electric Field in 1D Model
%D August 27, 2009
%O application/java

EndNote Export Format

%0 Computer Program
%A Duffy, Andrew
%D August 27, 2009
%T Point Charge Electric Field in 1D Model
%8 August 27, 2009

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

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Point Charge Electric Field in 1D 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 Boston University Physics Easy Java Simulation: Electric Field in 1D.

relation by Wolfgang Christian
Is Supplemented By

An interactive tutorial on electric field, developed for high school physics by The Physics Classroom.

relation by Caroline Hall
Is the Basis For

1st remix made
Ejs Open Source Electric Field & Potential of 2 Charged Particles Java Applet by lookang.
a remix of this original model by Professor Andrew Duffy.
customized it for sg syllabus

relation by wee lookang
Is the Basis For

2nd new remix is born! Re-purposed into Ejs Open Source Gravitational Field & Potential of 2 Mass Java Applet by lookang.
Many thanks to Professor Andrew Duffy for his original codes, to Professor Fu-Kwun Hwang for his forum and community of learners & to Professor Paco for creating Ejs toolkit and Professor Wolfgang for OSP codes.

relation by wee lookang
Is the Basis For

3rd remix probably final one, authentic case study of a exam question scenario Ejs Open Source Gravitational Field & Potential of Earth and Moon Java Applet by lookang.
based on Real Data!
customized by lookang based on an applet by Professor Andrew Duffy.
many thanks for allowing people to learn from your codes.
OSP guys and gals are heroes in physics education :)

This applet even has activities / exercises to promote student to notice, think about the physics examined illustrated :)

relation by wee lookang

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