Notes:
The 3D Field Mapping Interactive is an adjustable-size file that displays nicely on smart phones, on tablets such as the iPad, on Chromebooks, and on laptops and desktops. The size of the Interactive can be scaled to fit the device that it is displayed on. The compatibility with smart phones, iPads, other tablets, and Chromebooks make it a perfect tool for use in a 1:1 classroom.
The Interactive uses WebGL v. 2.0. Older browsers may not be compatible with this version of WebGL and the 3D component of this interactive may not be functional. It might be time to update that old browser. We observed great functionality in Chrome.
Teaching Ideas and Suggestions:
This Interactive does an excellent job of constructing electric field lines around a 1-nanocoulomb source charge or configuration of source charges. Source charges can be dragged onto the workspace and electric field lines (and lines of force) are immediately drawn. While the field lines do not have arrows on them, users can easily view them being drawn from + source charges to negative source charges. Any configuration of charges can be created on the workspace.
While the electric field line drawing of this simulation is excellent, the real value is in drawing the connection between the electric field lines and the electric potential or voltage. Equipotential contour lines are indicated in the 2D view by shades of red or blue with a change of color occuring in 2-Volt intervals.The simulation includes a "volt-meter" than can be dragged to any position on the workspace to measure the voltage at that location. A background grid displays distance using squares that are 1-meter in length along its edges. Color-coding is used to indicate the electric potential in the space surrounding the source charges. Red is used for high, positive electric potential and blue is used for low, negative electric potential.
A tap upon the Go to 3D View button (top right) allows a user to view a 3-dimensional topographic map of the electric potential in the space surrouding the charges. Arrow keys (or a mouse) can be used to manipulate and view the map from a variety of directions. The electric field lines and lines of force are drawn on the map. Students quickly realize that a positive charge will naturally move from a positive source downhill to a negative source. The movement of a positive test charge from a negative source charge to a positive source charge is an uphill climb. This concept makes the use of 3D Field Mapping a useful tool for transitioning from electrostatics to electric circuits.
The 3D view includes two export/download options - a .CSV format and a .STL format. The .CSV format can be imported into a spreadsheet program like Microsoft Excel. A surface plot can then be created from the data. See Figure 1 below. The .STL format is a common CAD (computer-aided design) format. It can be imported into a CAD program and even used for 3D printing for those who have 3D printers. An example of a 3D-printed design is shown in Figure 2.
We have published a student activity sheet for use with this interactive. The activity sheet is designed to provide students with a more guided experience when using this Interactive. View
Student Activity Sheet.
Related Resources
There are numerous resources at The Physics Classroom website that serve as very complementary supports for the 3D Field Mapping Interactive. These include:
- Minds On Physics Internet Modules:
The Minds On Physics Internet Modules include a collection of interactive questioning modules that help learners assess their understanding of physics concepts and solidify those understandings by answering questions that require higher-order thinking. Assignments SE10, SE11, and SE12 of the Static Electricity module provide great complements to this Interactive. They are best used in the middle to later stages of the learning cycle. Visit the Minds On Physics Internet Modules.
- Curriculum/Practice: Several Concept Development worksheets at the Curriculum Corner will be very useful in assisting students in cultivating their understanding, most notably ...
Charge Interactions
Electric Fields
Electric Field Lines
Visit the Curriculum Corner.
- Labwork:
Simulations should always support (never supplant) hands-on learning. The Laboratory section of The Physics Classroom website includes several hands-on ideas that complement this Interactive. Two notable lab ideas include ...
Action at a Distance Lab
Electric Field Lines Lab
Visit The Laboratory.
- Science Reasoning Activities:
Science classrooms should be filled with reasoning activities. We have several related activities in the Static Electricity section of the Science Reasoning Center that will challenge students to employ close reading, data analysis, and logical reasoning.
Visit the Science Reasoning Center.
Additional resources and ideas for incorporating 3D Field Mapping into an instructional unit on static electricity can be found at the
Teacher Toolkits section of The Physics Classroom website. Visit
Teacher Toolkits.
Credits
The Physics Classroom would like to extend a special thanks to Nerd Island Studios for the creation of this HTML5 Interactive. Visit their website (
http://www.nerdislandstudios.com) to see more great stuff by Nerd Island Studios.