Transcript
Fall 2008 Lecture 1-1 Physics 231 Electric Charges, Forces, and Fields Fall 2008 Lecture 1-2 Physics 231 Electric Charges Electric charge is a basic property of matter Two basic charges Positive and Negative Each having an absolute value of 1.6 x 10 -19 Coulombs Experiments have shown that Like signed charges repel each other Unlike signed charges attract each other For an isolated system, the net charge of the system remains constant Charge Conservation Fall 2008 Lecture 1-3 Physics 231 Two basics type of materials Conductors Materials, such as metals, that allow the free movement of charges Insulators Materials, such as rubber and glass, that don’t allow the free movement of charges Fall 2008 Lecture 1-4 Physics 231 Coulomb’s Law Coulomb found that the electric force between two charged objects is Proportional to the product of the charges on the objects, and Inversely proportional to the separation of the objects squared 221 r qqk F k being a proportionality constant, having a value of 8.988 x 10 9 Nm 2 /c 2
