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Magnetic field of the 2 wire currents in a external Bx magnetic field

Magnetic Field from 2 wires

The EJS Magnetic Field from 2 wires model computes the B-field created by an electric current through 2 straight wires in the z direction with the options of external magnetic fields. The user can click on any part of the 2D space to plot the magnetic field lines.

1. Watch the simulation as the field changes from the field around a long straight current-carrying wire to the field near a coil. Explain what happens to the field. Inside a coil of many loops, why is the field fairly uniform near the center (think about vector addition and what vectors would be adding together near the center).
2. There is an arrow on each end of the wire (red and blue). Which one shows the direction of the current in the wire? Explain.
3. The simulation also shows the magnetic flux. What is flux? Therefore, what do the different colors represent and why (i.e is pink higher flux than yellow or vice versa)? and what does "higher flux" mean in terms of the geometry and field strength?)?

Credits:

The Magnetic Field from Loops simulation was created by Fu-Kwun Hwang, edited by Loo Kang WEE using the Easy Java Simulations (EJS) modeling tool . Additional exercises written by Loo Kang WEE. You can examine and modify the model for this simulation if you have Ejs installed by right-clicking within the simulation frame and selecting "Open Ejs Model" from the pop-up menu. Information about EJS is available at: <http://www.um.es/fem/Ejs/> and in the OSP ComPADRE collection <http://www.compadre.org/OSP/>.

 

Translations

Code	Language		Translator	Run

Credits

Fu-Kwun Hwang - Dept. of Physics, National Taiwan Normal Univ. and lookang; Loo Kang Wee

http://iwant2study.org/lookangejss/05electricitynmagnetism_21electromagnetism/ejss_model_MagneticField2Wirewee4/MagneticField2Wirewee4_Simulation.xhtml

Apps

https://play.google.com/store/apps/details?id=com.ionicframework.magneticfieldwiresapp576914

https://itunes.apple.com/us/app/magnetic-field-of-wires-sims/id1164014778?mt=8 

Sample Learning Goals

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For Teachers

Examples of what can be simulated

current I1 = -1A, I2 = 1A #Magnetic #Field of 2 #current conducting wires #JavaScript #HTML5 Applet Simulation Model by Fu-Kwun Hwang and Loo Kang Wee

current I2 = 1A #Magnetic #Field of 2 #current conducting wires #JavaScript #HTML5 Applet Simulation Model by Fu-Kwun Hwang and Loo Kang Wee

current I1 = -1A #Magnetic #Field of 2 #current conducting wires #JavaScript #HTML5 Applet Simulation Model by Fu-Kwun Hwang and Loo Kang Wee

external magnetic field  Bx =0.5T #Magnetic #Field of 2 #current conducting wires #JavaScript #HTML5 Applet Simulation Model by Fu-Kwun Hwang and Loo Kang Wee

external magnetic field  Bx =0.5T,current I1 = -1A, I2 = 1A, showing the yellow resultant field lines that will result in force on wire1 to be down in the negative y direction, force on wire 2, force is positive y direction as the yellow field lines suggests closer separation at the top of wire 1 and bottom of wire 2. #Magnetic #Field of 2 #current conducting wires #JavaScript #HTML5 Applet Simulation Model by Fu-Kwun Hwang and Loo Kang Wee

Scenario from Boon Chien.

example of simulation features 

 

Research

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Video

Electromagnetism (part 2): Working Principles of a DC Motor by ETDtogo https://www.youtube.com/watch?v=e1Uz3Dcav-g   

 Version:

1. http://weelookang.blogspot.com/2016/06/magnetic-field-of-2-current-conducting.html
2. http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1290.0
3. http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1273
4. ejs_users-sgeducation-lookang-MagneticField2Wire.jar remixed Jar by Loo Kang Wee and Fu-Kwun Hwang
5. ejs_users-ntnu-fkh-twowiresBfield.jar original Jar by Fu-Kwun Hwang

Other Resources

1. http://web.mit.edu/8.02t/www/802TEAL3D/teal_tour.htm Magnetostatics: found this fantastic graphics for An animation of the magnetic field and forces generated by two parallel wires is visualized when the current in the wires run in opposite directions. When the current is turned on, the resulting magnet field pressure between the wires pushes them apart.

   http://web.mit.edu/8.02t/www/802TEAL3D/pirelli_images/Series_200.jpg

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