week1_chapter23

# week1_chapter23 - Physics 121 Sections 002 004 and 006...

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Physics 121 Sections 002, 004 and 006 Instructors: Lecture: Prof. Haimin Wang, Ext. 5781 Office 460 Tiernan, [email protected] http://solar.njit.edu/~haimin Use Moodle.njit.edu to post lecture notes Office Hours: Mondays. 10 to 11:25, Wednesdays 10 to 11:30, or by appointment Recitation: Prof. Halina Opyrchal Office 454 Tiernan, [email protected] Office Hours: Tuesdays: 10 to 11:30, Wednesdays 11:30 to 1 Week 1: Chapter 23 Electric Fields Part I: Electric Force Electricity and Magnetism – Forces The electromagnetic force between charged particles is one of the fundamental forces of nature. Other three forces: Gravitational Force Strong Force Weak force Introduction Electric Charges There are two kinds of electric charges Called positive and negative Negative charges are the type possessed by electrons. Positive charges are the type possessed by protons. Charges of the same sign repel one another and charges with opposite signs attract one another. Section 23.1 Electric Charges, 2 The rubber rod is negatively charged. The glass rod is positively charged. The two rods will attract. Section 23.1 Electric Charges, 3 The rubber rod is negatively charged. The second rubber rod is also negatively charged. The two rods will repel. Section 23.1

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Conservation of Electric Charges A glass rod is rubbed with silk. Electrons are transferred from the glass to the silk. Each electron adds a negative charge to the silk. An equal positive charge is left on the rod. Section 23.1 Quantization of Electric Charges The electric charge, q , is said to be quantized. q is the standard symbol used for charge as a variable. Electric charge exists as discrete packets. q = Ne N is an integer e is the fundamental unit of charge | e | = 1.6 x 10 -19 C Electron: q = - e Proton: q = + e Section 23.1 Conductors Electrical conductors are materials in which some of the electrons are free electrons.
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week1_chapter23 - Physics 121 Sections 002 004 and 006...

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