Physics 202
Tuesday, February 2, 1999
Announcements:
Sample exams are available on the class
web page
. Review
sessions for Tuesday's exam will be announced in class on Thursday. You will
be allowed to use one sheet of 8 1/2" by 11" paper during the exam. Be sure to
include any equations or constants you may need to use. Use of calculators on
the exam is permitted and be sure to bring a pencil.
Lecture notes:
More on Gauss' Law
•
What if the surface is curved and the electric field is not constant?
•
•
Then
∆Φ =
E
i
x
∆
A
i
;
Φ = Σ
E
i
x
∆
A
i
=
lim (
∆
A
i
approaches 0) E
i
x
∆
A
i
=
Ι
E
i
x
∆
A
i
•
I
is the integral symbol
Gauss' Law
•
The net electric field flux,
Φ
, through a closed surface is proportional to
the net charge enclosed by the surface.
•
Φ =
q/
ε
o
•
Example: The net electric flux through each surface is the same.
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In the following situation, the net flux is zero.
Example: Problem 6 from text
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 Spring '07
 MAHLON,GREGORYDA
 Gauss' Law, Magnetism, Electric charge, A. Ei dAi, Ei dAi, Ei x Ai

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