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.
- 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).
- 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.
- 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?)?
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/>.
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Fu-Kwun Hwang - Dept. of Physics, National Taiwan Normal Univ. and lookang; Loo Kang Wee
Sample Learning Goals
Examples of what can be simulated
|current I1 = -1A, I2 = 1A
|current I2 = 1A
|current I1 = -1A
|external magnetic field Bx =0.5T
|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.
Scenario from Boon Chien.
example of simulation features
- ejs_users-sgeducation-lookang-MagneticField2Wire.jar remixed Jar by Loo Kang Wee and Fu-Kwun Hwang
- ejs_users-ntnu-fkh-twowiresBfield.jar original Jar by Fu-Kwun Hwang
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.
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