What do you mean by conservation of charges?
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When two objects are rubbed together, both are charged equally, but the charges on them are of the opposite kinds. Thus the total charge of the objects before and after rubbing remains same. This is called conservation of charges.
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Name two substances which can be charged by friction.
What are the two kinds of charges?
Name three constituents of an atom and state the kind of charge on each of them.
What is the net charge on an atom?