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Unformatted text preview: UM PHY126 Review Sheet 1 PHY126 Review Sheet 1 by Dr. Sa-Lin Cheng Bernstein 1. Charges : Like charged objects (both positive or both negative) repel each other while oppositely charged objects attract each other. Matter is usually neutral with as many electrons present as protons. Atoms consist of electrons that have a charge of- 1 . 6 10- 19 C, neutrons that have a net zero charge and protons that have a charge of +1 . 6 10- 19 C. The charge on any object is quantized. A neutral object can be attracted by a charged object due to induction . Charge is conserved; charge can neither be created nor destroyed. 2. Electric field ~ E : Electric field at a given spot is a vector. Direction of ~ E is the same as the direction of the force ~ F on a positive test charge. Electric field does NOT depend on the test charge. Field is perpendicular to equipotential lines. Electric field points in the direction of decreasing potential. 3. Electric field lines : Electric field lines can be thought of as a map providing information about electric field. Electric field lines are NOT material objects....
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This note was uploaded on 04/10/2008 for the course PHY 232 taught by Professor Mr.nagy during the Spring '06 term at Michigan State University.
- Spring '06