## Thursday, June 9, 2016

### AJC lesson with 2 charges simulation enhancements

updated 09 June 2016

 Field Lines Q1 = 1 and Q2 = -5 http://iwant2study.org/ospsg/index.php/interactive-resources/physics/05-electricity-and-magnetism/01-efield/265-ejss-model-twopointcharges01

 Field Lines Q1 = 1 and Q2 = -4 http://iwant2study.org/ospsg/index.php/interactive-resources/physics/05-electricity-and-magnetism/01-efield/265-ejss-model-twopointcharges01

 Field Lines Q1 = 1 and Q2 = -3

 Field Lines Q1 = 1 and Q2 = -2

 Field Lines Q1 = 1 and Q2 = -1

 Field Lines Q1 = 1 and Q2 = 1

 Field Lines Q1 = 1 and Q2 = 2

 Field Lines Q1 = 1 and Q2 =3

 Field Lines Q1 = 1 and Q2 = 4

 Field Lines Q1 = 1 and Q2 = 5

updated 11 Nov 2015

 http://iwant2study.org/ospsg/index.php/interactive-resources/physics/05-electricity-and-magnetism/01-efield/265-ejss-model-twopointcharges01

updated: 26 FEb 2013
better field lines when Q1 and Q2 are opposite signs to each other
enjoy!

original authors: Fu-Kwun Hwang and lookang and szeyee
enjoy!

 version 26feb 2013 electric field lines drawn when Q1=-1C, Q2 = 2C https://dl.dropbox.com/u/44365627/lookangEJSworkspace/export/ejs_twopointcharges18q2work.jar original authors: Fu-Kwun Hwang and lookang and szeyee

 electric field lines drawn when Q1=-1C, Q2 =3C

 electric field lines drawn when Q1=-1C, Q2 = 4C. some bug with the calculating of out(i) simulation _pause too early

 electric field lines drawn when Q1=-1C, Q2 = 5C. some bug with the calculating of out(i) simulation _pause too early

made the enhancement to the electric field lines as proportional to strength of Q2.
thanks to goh khoon song for the feedback and use in his lessons.
Q1 is limited to -1 or 1, hence fore.

original authors: Fu-Kwun Hwang and lookang and szeyee
enjoy!

Ejs Open Source 2 Charge Model with Field Vector, Field Lines, Potential Visualization Representation Java Applet by Hwang Fu-Kwun. I did not make this, i only slightly edited it.
reference:
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=539.new#new
You can drag either charge and find out the new electric Field Vector, Field Lines, Potential distribution, need to release the charge for simulation to recalculate.
The field line are calculated in real time. However, please remember field line is not the same as trajectory for a test charge move in the same field.
You can add test charge if the check box were checked and watch the trajectory of test charge.
It is easy to draw those vectors which represent electric field at different positions.
Because we can calculate the electric field with .
However, do you know how those field lines were calculated?
Hint: The tangential components of electric field line is the same as the direction of electric field at the same point.
Biot–Savart law ! http://en.wikipedia.org/wiki/Biot%E2%80%93Savart_law

 electric field lines drawn when Q1=1C, Q2 = 2C

 electric field lines drawn when Q1=1C, Q2 = 3C

 electric field lines drawn when Q1=1C, Q2 = 4C

 electric field lines drawn when Q1=1C, Q2 = 5C

 electric field lines drawn when Q1=1C, Q2 = -2C

 electric field lines drawn when Q1=1C, Q2 = -3C

 electric field lines drawn when Q1=1C, Q2 = -4C

 electric field lines drawn when Q1=1C, Q2 = 5C

reference: