Class Notes NCERT Solutions for CBSE Students
Question: Why does a comb rubbed on hair attract pieces of paper?
Answer: The comb on rubbing became gets electrically charged and attract pieces of paper. This is called electrostatic force.
Question: Under what conditions do charges attract or repel each other?
Answer: Like charges repel and unlike charges attract each other.
Question: Why do we say that only repulsion is a sure test of charge on a body?
Answer: A charged body can attract an uncharged body and body with an opposite charge. Thus, repulsion alone is a sure test of whether a body is charged or not.
Question: What do you mean by ‘charging by conduction’? What kind of charge does the body acquire?
Answer: When a neutral object is charged by touching it with a charged body, it is called charging by conduction. The object acquires the same charge as that on the charged body.
Question: What is ‘charging by induction’? What kind of charge does the body acquire?
Answer: When a neutral object is charged by bringing a charged body near it without touching it, it is called charging by induction. The object acquires an opposite charge to that of the charged body.
Question: What is the difference between conductors and non-conductors? Give two examples of each.
Answer: Difference is as follows:
