L02 - Lecture 2 Coulombs Law Charge Density Sections 2.1...

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LECTURE 2 slide 1 Lecture 2 Coulomb’s Law, Charge Density Sections: 2.1, 2.2, 2.3, 2.4, 2.5 Homework: D2.1, D2.2; 2.1, 2.3, 2.5, 2.7, 2.9, 2.11, 2.13

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LECTURE 2 slide 2 The electric charge is a fundamental property of matter. It is measured in coulombs (C). The electric current unit ampere (A) was chosen as a basic unit in SI. Thus, coulomb is a secondary unit derived from C=A×s dQ i dt =− i is the electric current in amperes (A) Q is the electric charge in coulombs (C) t is time Electric Charge – 1
LECTURE 2 slide 3 Atoms contain particles carrying charge: electrons and protons. These particles react in opposite way to the influence of external electric fields. Therefore, they have opposite charges. It was agreed that the protons would have the positive charge, and the electrons would have the negative charge. The charge of an electron is equal in magnitude to the charge of a proton and is 19 1.602 10 , C e Qe =≈ × In this course, we are concerned with macroscopic charges, i.e., charge distributions much larger than the dimensions of the largest atomic nucleus ( 10 -15 m). Electric Charge

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LECTURE 2 slide 4 Charge occupies a finite volume. However, a volumetric charge can be always considered made of smaller charges, so small that they tend to a point. Point charge is a charge whose volume can be considered infinitesimal (a point) in comparison with the distance from its center to the observation point. This definition implies that it is an infinitesimal sphere of homogeneous charge distribution (charge density ρ v is constant).
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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L02 - Lecture 2 Coulombs Law Charge Density Sections 2.1...

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