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JDK1.0.2 simulations (1996-2001) => Electromagnetics => Topic started by: KOKI on December 31, 2008, 11:53:56 pm



Title: Capacitor Calculation
Post by: KOKI on December 31, 2008, 11:53:56 pm
Hi every body,

i want to know what we mean by a fringing? what its affect on the capacitor calculation? what its affect on the electric field intensity and electric flux density?
i search a lot about these questions, but i didn't understand :(

looking forward to hearing from all  ;)


Title: Re: Capacitor Calculation
Post by: KOKI on January 01, 2009, 01:22:34 am
Pleeeeeeeeeeeeeeeease help me , at least give some websits that may help me :'(


Title: Re: Capacitor Calculation
Post by: ganaren on March 27, 2009, 09:57:44 am
For the most part the electric field in between two capacitor plates is uniform, but near the edges it is not quite straight; this is called the fringe field. There is a good applet called Charges and Walls (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=198.0) that is really useful for seeing this.

Just draw two rectangular walls separated by a distance and fill the inside of one with 100 positive charges and the inside of the other with 100 negative charges. Then click show field.

davis252@gmail.com


Title: Re: Capacitor Calculation
Post by: Fu-Kwun Hwang on March 27, 2009, 10:11:37 am
Please check out the following attached image.


Title: Re: Capacitor Calculation
Post by: lookang on March 27, 2009, 04:07:15 pm
i do google image
http://images.google.com.sg/imgres?imgurl=http://www.physics.sjsu.edu/becker/physics51/images/25_02ParallelPlateCap.JPG&imgrefurl=http://www.physics.sjsu.edu/becker/physics51/capacitors.htm&usg=__xPyyH0dxN5AaiMa6YfFqKu4-SuM=&h=441&w=290&sz=56&hl=en&start=2&um=1&tbnid=i74IerJNVsdmTM:&tbnh=127&tbnw=84&prev=/images%3Fq%3Dfringing%2Bcapacitor%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN%26um%3D1
from (http://www.physics.sjsu.edu/becker/physics51/images/Proto2_r1_c1.jpg)
(http://www.physics.sjsu.edu/becker/physics51/images/25_02ParallelPlateCap.JPG)
http://www.physics.sjsu.edu/becker/physics51/images/25_02ParallelPlateCap.JPG

(b) When the plate separa-tion is small compared to the plate area, the fringing of the electric field at the edges is negligible.