Author Topic: Propagation of Electromagnetic Wave  (Read 642604 times)

sunilbalani

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topic35
« Reply #15 on: August 26, 2006, 02:46:15 pm »
great job thanks for making physics so understandable to students.it really helps if we can show them what really happens then talking about what happens. congratulations. great combination of physics and programming.

ferro638

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Re: Propagation of Electromagnetic Wave
« Reply #16 on: May 07, 2007, 02:42:14 am »
Hello!

Excellent animation! I'm doing a PowerPoint presentation about this subject. Is it possible to put this animation in my PoerPoint presentation, to be shown in a computer WITHOUT internet? If so, how can I do it?

Thanks.

Fu-Kwun Hwang

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Re: Propagation of Electromagnetic Wave
« Reply #17 on: May 08, 2007, 12:38:00 am »
As far as I know, java applets can not be embed into powerpoint.
However, you can download out applet and add a link in powerpoint to open the web page which contains java applets.

NightAngel

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Re: Propagation of Electromagnetic Wave
« Reply #18 on: July 05, 2007, 01:18:29 am »
hihi... can i have the source code? i was download the file, it is appear in .class file. is it possible view in source code from the .class file?

Fu-Kwun Hwang

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Re: Propagation of Electromagnetic Wave
« Reply #19 on: July 10, 2007, 05:58:16 am »
You should have received source code now.

kontellis

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Re: Propagation of Electromagnetic Wave
« Reply #20 on: February 06, 2008, 07:04:11 pm »
Hello Mr Huang and the rest of your team.
Congratulations for the great job you make.
I'm Kontellis George a teacher of Physics at 3rd Lyceum of Mytilini Greece.
I must thank you for the exciting Applets you have. Many topics of my teachings are much easier to teach with them.
I have two questions about EM waves.
1.  When EM waves transport inside an object is E/B equal with 300000000m/s or smaller?
2.  Near the antenna the two fields seem to have a phase difference of 90 but at a long distance their phase difference become zero. Why is that?
Thank you
George Kontellis
kontellis@sch.gr

Fu-Kwun Hwang

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Re: Propagation of Electromagnetic Wave
« Reply #21 on: February 07, 2008, 12:33:53 am »
1. E/B is the speed of the EM wave and the speed of EM wave is near c=3*108m/s in vacuum.
 But the speed is reduced to c/n when in an object, where n is the refraction index for that EM wave.
2. Could you explain why there is a 90 degree difference in phase for E/M wave  near the antenna?

oktarini

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Re: Propagation of Electromagnetic Wave
« Reply #22 on: August 10, 2008, 08:57:31 pm »
i can`t use it offline
i`ve done the download of newest java
but it can`t work well...
no picture showned

Fu-Kwun Hwang

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Re: Propagation of Electromagnetic Wave
« Reply #23 on: August 10, 2008, 10:18:55 pm »
What did you do with the downloaded file?
Did you unzip the file and open emWave.html with your browser?
I just tried it and it works fine with my browser.

Fu-Kwun Hwang

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Re: Propagation of Electromagnetic Wave
« Reply #24 on: August 11, 2008, 02:28:09 pm »
Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME

I just created an EJS version for the same simulation.


The speed of the electromagnetic wave depend on the Electric field E and magnetic field B.
 v=E/B
For the same material, the ratio should be fixed.
If only one of them is changed, it mean wave traveling in different material (index of refraction is shown in the simulation).


Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME

Prash

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Re: Propagation of Electromagnetic Wave
« Reply #25 on: March 21, 2009, 02:33:49 pm »
when photons have no charge then how time varying electric and magnetic fields generate?

Fu-Kwun Hwang

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Re: Propagation of Electromagnetic Wave
« Reply #26 on: March 21, 2009, 05:54:42 pm »
Photon and EM wave are two different models (particle vs wave) to describe light.
You can check out modern physics textbook for related information.


maxrk

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Re: Propagation of Electromagnetic Wave
« Reply #27 on: April 13, 2009, 11:55:10 pm »
Hi! Hwang
I very like your programing. I want to see source code java. I'm making project about electromagnetics.
please send me source code java  topic Electromagnetics
Thanks
Contact me : trcaoky@yahoo.com :)

Fu-Kwun Hwang

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Re: Propagation of Electromagnetic Wave
« Reply #28 on: April 14, 2009, 12:32:30 am »
You should be able to find the source code (attached file at the top message) now.

borlam

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Propagation of Electromagnetic Wave
« Reply #29 on: April 22, 2009, 01:28:05 am »
Hello,

If the default (reset) value represents the speed of light in a vacuum, then does this applet let you increase the speed of light?  Also, is it physically possible to have B greater than E?  It seems to me that would only happen if light were slowed to less than 1 m/s.  I read that physicists have slowed it to as little as 17 m/s. Would something bizarre happen to the nature of light if B were greater than E? Or would that not matter from a physics perspective.

I am grateful for your help in my understanding. Thank you.