I'm currently a Physics B student and I was wondering how you determine whether an online "Physics Tutorial/classroom" source is reliable and trustable based on the information it provides. For example the Physics Classroom. So far it has worked to my advantage but I'm not totally sure whether to rely on every piece of information. How can you be sure? Btw, please help me check the source I'm using: http://www.glenbrook.k12.il.us/gbssci/phys/Class/estatics/u8l1c.html [Broken] Thanks!