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lecture2 - E Fields are Produced by Produced by positive...

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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 thecharges producing the field it is a mathematical construct Units : N/C Forceon tiny “test charge” q 0 charge q 0
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Example: Calculate theforceon 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 charges, positive charges, and terminate on negative charges and terminate on negative charges Which way will a + or – chargemovein this field?
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E Fields between two charged plates E Fields between two charged plates + + + + + + + + - - - - - - - - Which way will a + or – chargemovein this field?
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Unformatted text preview: E Fields are Produced by Produced by positive Charges positive Charges +q ο q r Coulomb: r r qq k F e ˆ 2 = But also: E q F = ⇒ r r q k E e ˆ 2 = Field of a positive point charge q E The field decreases in strength (magnitude) with distance Several Charges: Several Charges: is the (vector) sum of the fields produced by the individual charges: E 2 1 ˆ n i i e i i i i q E E k r r = = = ∑ ∑ u 1 r 2 r 1 q 2 q 2 E 1 E E What are the signs of the 2 charges? Find the electric field of the three charges at the origin: C q μ 10 1-= C q 20 2 = 400mm 300mm 4 40 q C = x-axis y-axis Summary Summary Define: F E q ο = is force exerted on by . E q F is produced by other charges. E r r q k E e ˆ 2 = Point charge “q” produces:...
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