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 Author Topic: Ejs Open Source Long Magnet Falling Through solenoid Model Java Applet by LTL  (Read 16354 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
lookang
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 « Embed this message on: March 06, 2012, 11:32:00 am »

Ejs Open Source Long Magnet Falling Through solenoid Model Java Applet by LTL
derived from http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2391.0 by lookang
and
original model by http://www.compadre.org/osp/items/detail.cfm?ID=10327 Magnet Falling Through Ring Model
written by Francisco Esquembre.
This simulation was created as part of the MOSEM2 project.
As requested

Made some changes to the applet to make things neat and clear.

Comparison to motion of a ball is removed. In the worksheet I will ask how the motion of the magnet is compared to a ball and why (Ans: centre of mass motion should be identical. Although emf is induced at the ends of the solenoid, there is no conversion of energy from mechanical to electrical with a open circuit.)
Remove the simulation in relation to temperature of the coil. Again will ask in the worksheet.
Modified some of the control elements

I have attached a possible question scenario (will be refined to be a short guided inquiry ~30 mins). Will also produce a short video to demo the feature of the applet.

Question for you:

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• 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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 « Embed this message Reply #1 on: March 06, 2012, 11:33:41 am »

take the codes from NTNU
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 « Embed this message Reply #2 on: March 12, 2012, 12:45:18 pm »

added back analysis tool for conducting of investigation that |area| is equal for voltage versus time as the flux change is the same in and out of the solenoid.
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 « Embed this message Reply #3 on: March 27, 2012, 08:04:16 am »

fixed bug
ejs_MagnetFallingltlxmlcoil01.jar (1632k) fix bug of NorthSouth pole corrected with correct electron rotation direction  after feedback by RVHS
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 « Embed this message Reply #4 on: September 07, 2012, 08:58:42 am »

u can try to reproduce this effect
do you know how?

http://youtu.be/E97CYWlALEs

increase the B to about 100 T
enjoy!
 « Last Edit: September 07, 2012, 09:01:05 am by lookang » Logged
engrg1
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 « Embed this message Reply #5 on: September 10, 2012, 08:58:04 am »

Hi, all.

My attempt to draw the magnetic field.
Please change start_y and start_z to change the initial magnetic field

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
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• 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.
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 « Last Edit: September 10, 2012, 10:20:49 am by engrg1 » Logged
lookang
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 « Embed this message Reply #6 on: October 21, 2012, 06:53:25 pm »

This simulation was created as part of the MOSEM2 project.
As requested
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 « Embed this message Reply #7 on: December 19, 2012, 04:19:55 pm »

more changes

total changes

http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2391.0
changes made  February 08, 2012, 11:33:47 am » posted from:Rancho Cucamonga,California,United States
lay the magnet correctly now
changes button to face down as in normal convention of the pole going into solenoid
re arrange layout
add slider n input fields to all inquiry variables
figure out a way to draw the electrons but the code is not elegant
thanks to paco for his original code
discussion with teacher

I have collated as follows:
1) we need magnet to be of two colors ( red n blue) only. Grey between may give the students the wrong notion that zero emf between the peaks are due to zero magnetic flux.
done!
2) number tagged to every electrons is too near to the rings. Need to space it away from the electrons and ring if possible. So that students can decide the direction of a electron flow and see electron returns when magnet exits.
agree, text = ARIAL BOLD 18

http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2399.0
changes by tatlee08 March 06, 2012, 12:32:00 pm » posted from:Singapore,,Singapore
Made some changes to the applet to make things neat and clear.
Comparison to motion of a ball is removed. In the worksheet I will ask how the motion of the magnet is compared to a ball and why (Ans: centre of mass motion should be identical. Although emf is induced at the ends of the solenoid, there is no conversion of energy from mechanical to electrical with a open circuit.)
Remove the simulation in relation to temperature of the coil. Again will ask in the worksheet.
Modified some of the control elements

www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2629.0
engrg1 changes September 10, 2012, 09:58:04 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE
Modifications:
(1) Include the Magnetic Field lines (Remix the Magnetic Dipole Field 3D codes by Wolfgang . http://www.opensourcephysics.org/items/detail.cfm?ID=12361]
(2) Magnetic field lines only drawn initially
(3) Link the Strength Magnetic field to magnetic field lines
To change the "shape of the magnetic field", please change the start_y position.

19 December 2012
www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2629.0
but found a bug in the emf induced does not change direction with B = + or B = - values. fixed by added back the negative sign d (rotateElectrons)/dt = -I
added vertical and horizontal view capabilities to sync with pre-post test questions
made the slider values able to dynamically display the instantaneous values for associated learning
added g =0 for constant velocity
added constant velocity and slider with amos input
added induced forces with amos input

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lookang
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 « Embed this message Reply #8 on: February 14, 2013, 10:09:19 am »

discussion with teacher

In addition, just to clarify some points regarding the applet:
1. When L is increased, we are guessing it is actually the number of turns per unit length which is increased? Why does decreasing L cause the induced V to increase?
2. if that is the case, could you please help us to change parameter 'solenoid length' to 'number of turns per unit length'?
3. Could you also set as default the constant g, vertical case? That will be the bridging point which they are familiar with.

The file is here
https://dl.dropbox.com/u/44365627/lookangEJSworkspace/export/ejs_FallingMagnet08.jar

1. Currently, The length is the actual distance occupied by 30 turns
Decreasing L increasing the turns per unit length.

2. Turns per unit length = 30/L, I will change the slider according but I no sure if it is correctly shown, please check.

3. vertical as default with g = 9.81.

Enjoy!

the right panel is modified as per our discussions with another teacher.
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"Nothing in life is to be feared, it is only to be understood." ..."Marie Curie 1867-1934, Polish born French Physicist, Twice Nobel Prize Winner- Physics and Chemistry)"