NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/
December 16, 2017, 03:04:02 am *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
 
   Home   Help Search Login Register  
The most important medicine is tender love and care. ..."Mother Teresa(1910-1997, Roman Catholic Missionary, 1979 Nobel Peace Prize)"
Google Bookmarks Yahoo My Web MSN Live Netscape Del.icio.us FURL Stumble Upon Delirious Ask FaceBook

Pages: 1 [2]   Go Down
  Print  
Author Topic: charged particles and non uniform magnetic field/board:26-1-  (Read 34579 times)
0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #30 on: June 29, 2013, 10:16:54 pm » posted from:MILANO,LOMBARDIA,ITALY

sorry professor I found a possible error in the program.

if I set B = 0 to verify that the speed is correct I find that

scale of wall 600

if I put 1 (arbitrary units) = 100um i have that 10 km / s are 1 km / s
if I put instead 1 (arbitrary units) = 1000um I find that 10Km / s are 10Km / s

but if I calculate the radius of curvature with any value of sigma B and I find that 1 (arbitrary units) = 100um

where is the error, maybe in the time? Huh Huh Huh
 i need your help thanks

i'm sure (maybe!!! Grin) that the time si ten times more big of normal

1 arbitrary unit =100um yet if you put time divided by (time/10)

e.g.
default values but B=0
traiectory linear deltax=1.01 arbitrary units, time=5.05us

1 arbitray units =100um

if you choose time 5us you get 20m/s, not 0,2Km/s
if you choose time 5us/10 get 200m/s, real 0.2Km/s

default values B=1T
if you calculate the diametrer of traiectory you find
1=100um

as we told in the past

addition to the time that must be divided by 10 should improve two parameters.

1. at any scale,  the cursor speed should not exceed 100Km/s are not relistic higher speed.
2. the  time step, at any scale, must not exceed 2us at higher values ​​the simulation is very bad

thanks

« Last Edit: June 30, 2013, 12:05:20 am by danielemateriale » Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #31 on: June 30, 2013, 03:02:56 am » posted from:MILANO,LOMBARDIA,ITALY

please also you could put a space where you can numerically enter the angle of the velocity vector (in short, choose the direction) using a numerical value

please put in the video of the programm the (down and right) the written 1=100um is much important for the user and  show with a figure the direction of B.

thanks
« Last Edit: June 30, 2013, 03:10:20 am by danielemateriale » Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #32 on: June 30, 2013, 08:12:05 am » posted from:,,Satellite Provider

The time step and frame rate was not set correctly. It is done.
It will be better if you can provide a jpg/gif file which show direction for B,x,y (lower left corner)
Then, I will replace it.

Click the eye (image) to display the simulation

Embed a running copy of this simulation

Embed a running copy link(show simulation in a popuped window)
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
  • 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!
Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #33 on: June 30, 2013, 02:49:49 pm » posted from:MILANO,LOMBARDIA,ITALY

thanks so much for the improve the simulation. i have attach a gif file for the axis.


* Assi-cartesiani modificata.gif (14.83 KB, 608x441 - viewed 342 times.)
Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #34 on: June 30, 2013, 03:08:39 pm » posted from:,,Satellite Provider

It is updated again (in the previous message). Your image file is a large one so it is reduced in the simulation.
The X,Y,B might not be so clear.Is the size OK?
It will be better if the original image file is a small size. Or give me a image with the exact size to fit the simulation will be perfect.
Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #35 on: June 30, 2013, 03:08:59 pm » posted from:MILANO,LOMBARDIA,ITALY

excuse professor but the problem of time persists

eg

default values ​​but B = 0

in the latest version of the program:

deltax = 1.35 units, deltatime = 6.784us

if we have 1 = 100um

we have 135um and divided by deltatime you get 20m / s

instead the speed that is correct, and set to 200m / s

so the time must be divided by 10 to a correct result
thanks
Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #36 on: June 30, 2013, 03:19:11 pm » posted from:MILANO,LOMBARDIA,ITALY

this is a another gif. if you don't like tell me what you need Smiley


* Senza titolo-1.gif (10.13 KB, 451x350 - viewed 342 times.)
Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #37 on: June 30, 2013, 03:26:17 pm » posted from:MILANO,LOMBARDIA,ITALY

there are other attachs


* Senza titolo-2.gif (1.95 KB, 119x93 - viewed 303 times.)

* Senza titolo-3.gif (2.76 KB, 166x129 - viewed 341 times.)
Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #38 on: June 30, 2013, 03:46:10 pm » posted from:,,Satellite Provider

The simulation has been updated with latest image file.

The mistake was from the mis-interpretation. It is correct now. (The unit for time is not us but 0.1 us, the display has been changed).

Actually, the unit used in the simulation is v(m/s), m(kg), r(m), B(T), q (1.6 C)

The default for the simulation is m=1kg, v=0.2m/s, B=1 T, q=1.6C
From r=\frac{mv}{qB}={1*0.2}{1.6*1}=\frac{1}{8}=0.125

However, you would like to change the interpretation.
m=1*10^{-26}kg, v=0.2 km/s, B=1T, 1=1.6*10^{-19}C
So r=\frac{1*10^{-26}*0.2*10^{3}}{1.6*10^{-19}*1}=0.125*10^{-4}m
That is why we call the 1 unit =100 um.

Because the unit for space become 100um, the unit for speed become km/s
So the time step is 10^{-4}/10^3= 10^{-7}s =0.1us

It should work fine now.

Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #39 on: June 30, 2013, 04:07:51 pm » posted from:MILANO,LOMBARDIA,ITALY

ok you are right.
« Last Edit: June 30, 2013, 04:36:15 pm by danielemateriale » Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #40 on: June 30, 2013, 04:37:04 pm » posted from:MILANO,LOMBARDIA,ITALY

thanks now the programma work very well.
Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #41 on: June 30, 2013, 05:00:50 pm » posted from:MILANO,LOMBARDIA,ITALY

professor thanks for your help. the program is finished.

I thank you now for I can not do nothing but offer her my services

as I said before I am able to:

- Use photoshop cs3
- Use autodesk inventor professional
   . designs for mechanics
   . jewelry
   . laser cutting
   . etc ...
- Use programs for the calculation of structural mecchanic parts
   . beams
   . bolts
   . toothed wheels
   . etc ...
- Use program for simulation of magnetic fields in 2d PERMAG
- Use simple programs for the simulation of thermal exchange in 2d now and in the future in 3d

send me a mail (ony for professor FU-Kwung Hwang) whit your request and if i can i'll do it for free. Grin

We can became friend on facebook i have send you a request as Anto***** Daniele Grin
« Last Edit: June 30, 2013, 05:08:32 pm by danielemateriale » Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #42 on: June 30, 2013, 05:57:39 pm » posted from:,,Satellite Provider

The final version is uploaded again for easy access.

Click the eye (image) to display the simulation

Embed a running copy of this simulation

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



You are welcomed. I only hope the final simulation is what you really need.
Are you going to use the simulation for teaching?

It take time to fully understand what you really want. And I also learn something during the process.

Regards!  Grin

Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #43 on: June 30, 2013, 06:23:30 pm » posted from:MILANO,LOMBARDIA,ITALY

not for teaching, other reason.

thanks for have accept my request on facebook  Grin

Do you like inventions? i like very much, from when i was a child, and I delight to do inventions in  mechanical.

I needed this simulation to see if my idea was valid or not.

it's valid!!!

thanks so much professor and if you need something in the previuos my post, as said my god, you only have to ask and you will be given Grin
Logged
Fu-Kwun Hwang
Administrator
Hero Member
*****
Offline Offline

Posts: 3080



WWW
«
Embed this message
Reply #44 on: June 30, 2013, 07:09:59 pm » posted from:,,Satellite Provider

I hope your ideas can be realized soon!  Cheesy
Logged
danielemateriale
Jr. Member
**
Offline Offline

Posts: 48


«
Embed this message
Reply #45 on: June 30, 2013, 10:26:12 pm » posted from:MILANO,LOMBARDIA,ITALY

thanks Cheesy
Logged
Pages: 1 [2]   Go Up
  Print  
The most important medicine is tender love and care. ..."Mother Teresa(1910-1997, Roman Catholic Missionary, 1979 Nobel Peace Prize)"
 
Jump to:  


Related Topics
Subject Started by Replies Views Last post
Charged particle motion in uniform magnetic field (2D)
Electromagnetics
Fu-Kwun Hwang 1 98870 Last post February 02, 2016, 02:37:17 pm
by caso
A super-conducting loop moving across a uniform magnetic field region.
Electromagnetism
Fu-Kwun Hwang 0 11836 Last post February 25, 2007, 08:25:39 pm
by Fu-Kwun Hwang
Charge in a uniform magnetic field in 3D
Electromagnetism
jmz 6 18500 Last post December 08, 2010, 10:37:14 pm
by Fu-Kwun Hwang
A super-conducting loop moving across a uniform magnetic field region.
electromagnetism
ahmedelshfie 0 4219 Last post May 25, 2010, 02:12:14 am
by ahmedelshfie
Charge in a uniform magnetic field in 3D
electromagnetism
ahmedelshfie 2 6321 Last post October 04, 2010, 12:23:30 pm
by lookang
Powered by MySQL Powered by PHP Powered by SMF 1.1.13 | SMF © 2006-2011, Simple Machines LLC Valid XHTML 1.0! Valid CSS!
Page created in 0.284 seconds with 23 queries.since 2011/06/15