Two kinds of charges: unlike charges attract like charges repel

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Presentation transcript:

Two kinds of charges: unlike charges attract like charges repel Charge is conserved Charge is quantized Fundamental amount of charge: Charge of a single electron: e Coulomb’s Law

Electric Field

A Field: Has a well defined value at every point of space Examples: Elevation: H(x,y) Temperature T(x,y,z) Wind Speed W(x,y,z) Scaler field Vector field A Field: Has a well defined value at every point of space Field does not depend on how we measure it: ie: our measurement does not change the field The field is “out there” whether we measure it or not

Electric Field due to a charge q Electric field is the electric force acting on a unit positive charge Fe = E qo

Linear

Example 23.7 from the text book: Electric field due to a charged Rod The example worked out in detail in the text book is similar to the one We did in class (the location of the rod is different).