PHYS 142 Chapter Notes - Chapter 23: Test Particle, Electric Field, International System Of Units
8 May 2012
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23. 1 properties of electric charges: electric charges. Charges of the same sign repel one another and charges with opposite signs attract one another. Electric charge is conserved in an isolated system. The electrified state is due to a transfer of charge from one object to the other. Electrons are transferred in the rubbing process from the glass to the silk. The electric charge q is said to be quantized, where q is the standard symbol used for charge as a variable. That is, electric charge exists as discrete packets and we can write , where n is some integer. 23. 2 charging objects by induction: insulators. How to charge an insulator: conductors. Induction: charging an object by induction requires no contact with the object inducing the charge. Semiconductors are a third class of materials, and their electrical properties are somewhere between those of insulators and those of conductors.
