Prozorov_02 - PHYSICS 222 Introduction to Classical Physics...

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PHYSICS 222 Introduction to Classical Physics II Prof. Ruslan Prozorov Iowa State University Fall 2011 LECTURE 2 Electric field and forces. Superposition. Dipole.
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a concept of fields 24 August 2011 Physics 222 - Prof. Ruslan Prozorov - Iowa State University 2 scalar (single valued) temperature distribution field
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vector field: a wind map 24 August 2011 Physics 222 - Prof. Ruslan Prozorov - Iowa State University 3 magnitude and direction
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field lines follow the same magnitude 24 August 2011 Physics 222 - Prof. Ruslan Prozorov - Iowa State University 4
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schematic view of an electric field 24 August 2011 Physics 222 - Prof. Ruslan Prozorov - Iowa State University 5
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more formal definition 24 August 2011 Physics 222 - Prof. Ruslan Prozorov - Iowa State University 6 1 2 2 Q Q k r r r F - Coulomb law we can re-write this as: 1 2 1 2 2 2 2 Q Q Q k k Q Q r r r r r r F E here represents an electric field created by charge Q 1 at the location of charge Q 2 . Note, that this field does not depend on Q 2 , so it is fully determined by the charge Q 1 . E
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