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lecture2 - El ectr i c Fi el ds D efi ni ti on El ectr i c...

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Electric Fields
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Definition: Electric Field E q ο q Force Field Picture: The “source” charge q produces an electric field in space. The field pushes on the “test” charge q 0 . ?
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Definition: Electric Field = F E q ο = A vector Exists before test charge is introduced Is produced by other charges (not q 0 ) q 0 is small so as to not disturb the charges producing the field it is a mathematical construct Units : N/ C Force on tiny “test charge” q 0 charge q 0
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Example: Calculate the force on an alpha particle (q = +2e) if it is placed in the field. q [ ] = C N E 1000 Repeat for an electron.
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E Fields are E Fields are Produced by Produced by positive positive charges, charges, and terminate on negative charges and terminate on negative charges Which way will a + or – charge move in this field?
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E Fields between two charged plates E Fields between two charged plates + + + + + + + + - - - - - - - - Which way will a + or – charge move in this field?
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E Fields are Produced by positive Charges Charges +q ο q r Coulomb: r
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