EDIT: I'm extremelly sorry, i just noticed the sticky above my post saying not to post homework qustions in the forum. Dear Physics Forums, I am a 16 year old high school student currently doing year 11 physics. To do this weekend we were givin an exercise sheet with various questions about electrostatics. Unfortunatly I have found this area of physics hard to comprehend and am unable properly understand my text books. I have had to continually ask the teacher for help in class but have not been given the explainations I need to help me understand. I'm afraid if i ask the teacher to clarify what he means or continually ask him for help i'll be seen as a bit of a dumbarse to everyone else. I know I shouldn't care about this but I would feel much more comfortable getting help from somewhere such as this where i'm more likely to be around more mature people and would no longer feel discouraged to seek help. I was wondering if anyone here woudl be able to help me find answers to the following questions... I dont want to be todl the answer outright, I want to make sure i know exacyly why that's the answer, else my end of semester exams are goin to be hell. I have 6 questions to do and thought it best to post a new question only after i can understand the previous questions answer. The first questions i'm farely comfident about but thought it best to ask just incase i've gone wrong. Question 1 In each of the following cases indicate whether the object has a net negative charge, a net postive charge, or is uncharged. A plastic ruler when rubbed on your jeans becomes negatively charged. (a) What is the charge on the part of your jeans you rubbed? For this i wrote net postive charge, but then thought the jeans would likely be earthed so i wrote uncharged. (b) The charged ruler is brought close to two isolated conducting spheres (A and B) which are in contact. What is the charge on sphere A. In a picture provided the ruler is shown to be on the side of A opposite to where B is touching. I wrote the charge on A would be postive. Because electrons are replelled onto sphere B. (C) While the ruler is kep in the same position, B is removed. What is the charge on B? I wrote negative because of the excessive electrons that had been pushed onto the sphere. (D) If, instead, the ruler is removed, then sphres A and B are seperated. What is the charge on A? I wrote no charge. Because when the ruler is removed the elctrons redistirbute themselves out over the sphres again, meaning when the spheres are seperated they both are uncharged. Thankyou for your time.