Chapter 2. Coulomb’s Law & Electric Field Intensity

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1 Chapter 2. Coulomb’s Law & Electric Field Intensity
The Experimental Law of Coulomb The Force between two very small objects separated in a vacuum or free space by a distance which is large compared to their size: 목원대학교 전자정보통신공학부 전자기학

2 Electric Field Intensity
The first charge: fixed position The second charge: moving around to test force field E: The vector force on a unit positive test charge Cartesian coordinates, charge Q at the origin When a charge is not at the origin, 목원대학교 전자정보통신공학부 전자기학

3 The Coulomb forces are linear⇒The electric field intensity.
목원대학교 전자정보통신공학부 전자기학

4 Field Due to A Continuous Volume Charge Distribution
A tremendous number of charges separated by minute distances A Volume Charge Density The incremental contribution by an incremental charge The contribution of all the volume charge 목원대학교 전자정보통신공학부 전자기학

5 Field of A Line Charge Consider a charged conductor of very small radius A line charge of density A volume charge density The E resulting from a uniform line charge density. Which coordinates the field does not vary. Which components are not present. No component may vary with The z axial symmetry: E are not f(z). We have only an component. 목원대학교 전자정보통신공학부 전자기학

6 By substituting r-r’ 목원대학교 전자정보통신공학부 전자기학

7 Field of A Sheet of Charge
Consider the infinite sheet of charge having uniform density A sheet charge density 목원대학교 전자정보통신공학부 전자기학