# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## 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 imagehttp://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%3D1from (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.