Summary of Class 21
Exam 2 Information
Summary of Class 21
TEST TWO Thursday Evening April 1
7:30 9:30 pm.
The Friday class
immediately following is canceled because of the evening exam.
What We Expect From You On The Exam
1.
An understanding of the properties of conductors.
2.
An understanding of capacitors. You will not need to know about the effects of
dielectrics.
3.
An understanding of current flow in a resistive material, e.g. how J is related to
I
,
how E is related to J, how resistance is related to resistivity, and how to calculate it.
4.
An understanding of simple circuits. For example, you should be able to set up the
equations for multiloop circuits, using Kirchhoff’s Laws.
You should be able to derive
and guess the solution to differential equations for RC circuits, and should understand the
meaning of time constants (
τ
=
RC).
5.
A conceptual understanding of how to determine the direction of magnetic fields
of moving charges or current elements using the BiotSavart law, e.g.
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 Fall '10
 DOURMASHKIN
 Magnetism, Magnetic Field, external magnetic field, PRS inclass questions, magnetic moment vector

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