[quote author=Fu-Kwun Hwang link=topic=97.msg495#msg495 date=1078707539]
<IMG src=/demolab/phpBB/pics/fieldLine.jpg>
There are two fixed charge (red +/ blue negative) create an electric field around the test charge.
If the initial velocity of test charge is zero. What is the trajectory of the test charge?
Will it following the electric field line?

You can test your answer in the following post. Play with the simulation!
You can drag test change to another position and try it again ...

Would you please allow me to download it?