Yes. You are free to use it in your class. You are welcomed to check out related topics at
[url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=539.0]Electric field structure and Field lines for two point charges +/-[/url]
or [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=164.0]charged Particles and Walls[/url]
or [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=319.0]Image charge: point charge and a sphere[/url]