<![CDATA[Electric_Field_What_is_Wrong]]> false false true true false ]]> ./CoulombForceWrong/Screenshot 2023-08-11 at 11.56.50 AM.png ./01authorPacoEsquembre2011.png;./1authorlookangphoto5050.png DESCRIPTION_EDITOR Coulomb Force: What is Wrong? true false _default_ Coulomb Force: What is Wrong? true 20 1 true VARIABLE_EDITOR Field Vars true false VARIABLE_EDITOR lookang true false VARIABLE_EDITOR Display Vars true false CODE_EDITOR Init Page true false CODE_EDITOR Init Page 2 true false LIBRARY_EDITOR Calculate Force true false LIBRARY_EDITOR add Charge true false nmax-1) { _tools.showOkDialog("Too many charges! Model is limited to 6 charges."); //_view.alert("addChargeButton","Too many charges","Model is limited to 6 charges."); } else { x[n]=-1+2*Math.random(); y[n]=-1+2*Math.random(); color[n]=n; q[n]=1; r[n]=q[n]/10; colorStr+=StrData[n]+";"; n=n+1; } calcF(); } ]]> LIBRARY_EDITOR set Q true false LIBRARY_EDITOR setComboBox true false HTML_VIEW_EDITOR HtmlView Page true false 0 0 0 800 600 true true Elements.Panel true Elements.Panel true Elements.Panel Elements.Button Elements.ComboBox Elements.Label Elements.Slider Elements.ParsedField Elements.TwoStateButton Elements.Button Elements.Button Elements.Button true Elements.WrappedPanel true Elements.PlottingPanel Elements.ShapeSet2D Elements.ArrowSet2D true Elements.Group2D Elements.ShapeSet2D true Elements.Group2D Elements.TextSet2D Elements.Panel Coulomb Force Wrong Model

The EJSS Coulomb Force Wrong model challenges students to identify errors in a simulation involving multiple charges, complete with force vectors. Users are empowered to modify individual charges and introduce additional charges. This model can be examined and rectified if EJSS is installed.

Exercises:

  1. Run the simulation and explore in https://macmath.inf.um.es/ by clicking on Edit on WebEJS button. Rearrange the charges to observe the force vectors and their magnitudes. Analyze the model's correctness and gather evidence to support your observations.
  2. Utilize the slider to adjust the charge of a selected charge (its size will also change to indicate the modification). The drop-down menu permits you to choose the charge (by color) for adjustment. Identify any discrepancies in the force vectors or magnitude readings. Provide evidence for your observations. For confirmation, add an extra charge using the Add Charge button.
  3. If you have EJSS installed or on https://macmath.inf.um.es/, embark on rectifying the identified issues within the model. The correction lies within Model->Custom->Calculate Force. Elaborate on your corrective steps. (Background understanding required: arrays and for loops or refer to EJSS Computing Basics.)

References:

  • Giancoli, Physics for Scientists and Engineers, 4th edition, Chapter 21 (2008).

Credits:

The Coulomb Force Wrong Model was conceived by Anne Cox, Wolfgang Christian, and Francisco Esquembre, utilizing the Easy JavaScript Simulations (EJSS) authoring and modeling tool. Exercises were composed by Anne J Cox, Darren Tan, and lookang.

Navigating to Model: Using the EJSS authoring toolkit installed, follow these steps: Select "A EJSS digital Library," choose "JS EJS model in Singapore" from the Library, double click the "05electricitynmagnetism_11efield" folder, and then double click on the "CoulombForceWrong" filename. Finally, click the "Download" button. Store the model source code within your EJSS defined workspace/source/ directory.

For more information about EJSS, visit: http://www.um.es/fem/Ejs/ and explore the OSP ComPADRE collection: http://www.compadre.org/OSP/.

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