Updated:
Chapter 20 Magnetism
A. Instruction to students:
Homework:
1) Read carefully Sections from 20-1 through 20-6 plus 20-9.
2) Do all Examples in the text from 20-1 through 20-9.
3) Do all sample multiple choice problems posted.
Following
formula and constants from Chapters 20 will be given
during the
exams. Practice how to use and apply them.
F =
I el B sin(theta)
F = q
v B sin(theta)
B =
\mu_0 I / (2 \pi r)
\mu_0
= 4 \pi x 10^(-7) T m / A
B.
Biomedical (and technological) application:
How
electric motors work, Section 20-10, p605 as an application
of Section 20-9.
C.
Lectures and study guideline
Since magnetism
is more difficult to see intuitively than electricity, read Sections 20-1
and 20-2 carefully,
and then
learn and
practice the right-hand rules illustrated in Figs. 20-10/12 and 20-13.
The directions
of the various vector quantities are important, as well as their magnitudes.
In class, we will
go through how to apply the formulas in 4) above,
and also how to use
the right-hand
rule!
The new unit in this
chapter is tesla (T), a unit of the magnetic
field.
1 T
= 1 N / A m
as seen from the formula
F = I el B
sin(theta).