electrical energy & capacitance today & tomorrow first: wrap up gauss’ law rest of the...
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electrical energy& capacitance
•today & tomorrow
•first: wrap up Gauss’ law
•rest of the week: circuits/current/resistance
•NEXT MON: exam I
multiple choice, cumulative
more details throughout the week
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(c)
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(c)
PE = (1 due to 2) + (2 due to 1)(E to bring 1 close to 2)(E to bring 2 close to 1)
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what is the potential energy of the “crystal”
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1 2
3 4
we just have to sum the energy of allunique pairs of charges.
so how many are there?
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it works for more complicated stuff
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Rocksalt Rutile
M = -1.75 M = -4.82
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travel along surface:
E perpendicular to path everywhere
no work done!
electric force isconservative ...
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equipotential lines?contours of constant V
no work to move along them
(like gravity)
x, y = spatial coordinatesz = electric potential
x, y = spatial coordinatespotential constant on lines
3d
2d
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conductor = mirror for field & potential lines
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