Charge in a uniform magnetic field in 3D

jmz

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1 Charge in a uniform magnetic field in 3D

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on: March 10, 2010, 08:27:42 pm »

You can change the orientation of the magnetic field. If you open the control window you can also modify the charge options

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Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

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chargeinNS.gif (25.13 KB, 801x502 - viewed 1224 times.)
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lookang

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2 Re: Charge in a uniform magnetic field in 3D

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Reply #1 on: March 10, 2010, 09:35:59 pm »

nice applet!

i have a couple of suggestions but i will just give one for now.
make the field a volume with some transparency , the lines currently alone is hard for learners to appreciate the region of the 3D space where there is magnetic field lines.

wow, U r a Colos member! cool! hope to see more applets from U!


« Last Edit: March 10, 2010, 09:39:49 pm by lookang »	Logged

jmz

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3 Re: Charge in a uniform magnetic field in 3D

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Reply #2 on: March 11, 2010, 11:25:32 pm »

Quote from: lookang on March 10, 2010, 09:35:59 pm

make the field a volume with some transparency , the lines currently alone is hard for learners to appreciate the region of the 3D space where there is magnetic field lines.

I think it is a good idea, I'm working on it, please let me know if you have more comments


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lookang

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4 Re: Charge in a uniform magnetic field in 3D

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Reply #3 on: March 12, 2010, 09:02:54 am »

from the point of a learner, it will make learning relational when it is possible for the the learner to verify the equation of motion of a charged particle in B field.

F = v^B*q

in the case of a constant velocity and in a circular motion case

F = m*v*v/r

v^B*q = m*v*v/r

B*q = m*v/r

make B, r, m, v measurable helps the learner to understand the equation is really a suitable model to predict the motion.

http://www.lon-capa.org/~mmp/kap21/cd533capp.htm
has some interesting features you may take reference from


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Fu-Kwun Hwang

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5 Re: Charge in a uniform magnetic field in 3D

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Reply #4 on: March 12, 2010, 04:00:15 pm »

$\vec{F}=q\vec{v}\times\vec{B}$ .
The following show a charged particle trapped bwtween two uniform field.
You can use sliders to change the width and the separation between two sets of magnet.
The magnetic field is assumed to be uniform $Bz\hat{z}$ inside the magnet region. and the field is zero when outside the boundary.

You can change the location and velocity of the charged particle with mouse drag and drop or with sliders.

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)

Please feel free to post your ideas about how to use the simulation for better teaching and learning.
Post questions to be asked to help students to think, to explore.
Upload worksheets as attached files to share with more users.

Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!


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lookang

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6 Re: Charge in a uniform magnetic field in 3D

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Reply #5 on: December 08, 2010, 12:17:04 pm »

Hi prof,

i noticed a bug in the direction of F magnetic.

// use return q*v*(-Bz) instead of return q*v*(Bz); becaue Bz is define as down positive

btw i manage to create 2 variant simulations
Ejs Open Source Charge Particle in Magnetic Field B Java Applet in 3D
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1972.msg7328#msg7328

Ejs Open Source Cyclotron Java Applet in 3D
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2021.msg7600#msg7600

i will update the 2 variant simulations soon!


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Fu-Kwun Hwang

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7 Re: Charge in a uniform magnetic field in 3D

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Reply #6 on: December 08, 2010, 10:37:14 pm »

Thank you for the bug report. It is updated now!


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