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Physics 132 - General
Physics II - Professor
Bunson
Fall 2001
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Today's Lecture (9/7): |
| Summary: |
- Coulomb's Law will tell you the electric field
for a point charge. If you have several charges, you need to add these
as vectors. If you have a distribution of charges, you need to do
an integral that is somewhat tricky. Gauss's Law provides a way around
this for special situations, but first we need a few definitions.
- Flux: this is the amount of flow
through a surface.
A vector field such as fluid flow or an electric field has zero flux
if it parallel to a surface. This suggest the following formula:
In general, the field does not have to be constant and so you would
need to integrate to find the flux.
- Gauss's Law relates the flux of an electric
field through a closed surface to the charge contained in
that surface:
- Gauss's Law is useful for the following types
of symmetry: Planar (see worked problem), spherical
and cylindrical.
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| Conceptests: |
No conceptests today.
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| Worked Problems: |
Today's worked
problem.
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| Links: |
No links for today.
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Assignments: |
Next
Reading Assignment (due 9/10)
Next
Homework (due 9/12)
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Diversion-of-the-week: |
This week's diversion involves folding
your money into funny shapes. I'm told that downtown stores love dollar
bill origami so give it a try!
(I recommend starting with the bow-tie.)
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August 15, 2001.
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