Announcements:
- Jan 7: Physics Department Climate Document
- Jan 7: To insure that I do not miss your emails, use the
string [110b] at beginning of
the subject line.
- Feb 4: Information about the midterm
- The midterm is on Tuesday February 11.
- The midterm will cover the chapters in Griffiths covered
up to and including those from the Week
of February 3 (Tuesday's lecture only). (See Tentative
Schedule at the bottom of the
page)
- You can bring two sheets of notes to the exam. You can
write on both sides.
- I will also distribute this formula cheat
sheet with the problems.
- For practice: last quarter's midterm is here.
And here
are the solutions. NOTE: the midterm had four
problems, but students had to solve only three of them.
- Here
is the distribution of scores for last quarter's
midterm.
- It is likely that the midterm will also include a few
quick multiple choice conceptual questions. TBD.
- There will be a review session on Sunday February 9, 12
noon, Broida 1640. I will not prepare anythinf special, I
will just be there to answer questions. So: bring
your questions.
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| Instructor: |
Claudio Campagnari |
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| Email: |
claudio@physics.ucsb.edu |
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| Office: |
Broida 5125. Phone 805-893-8802.
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| Office hours: |
Thursday 12:30-1:30, or by appointment, or whenever
you can find me.
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| Administrative Assistant: |
Debbie Ceder |
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| Email: |
dla@physics.ucsb.edu |
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| Office: |
Broida 5014. Phone 805-893-2058. |
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| Teaching Assistant |
Ziyue Wang
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| Email: |
zi-yue@ucsb.edu
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| Office hours: |
Wednesday 3-5 pm
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Learning Assistant
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Filippo Delzanno
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Email:
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fdelzanno@umail.ucsb.edu
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Office hours:
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Tuesday 3-4 pm Wednesday 1-2 pm
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Learning Assistant
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Franklin Myhre
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Email:
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fmyhre@ucsb.edu
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Office hours:
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Tuesday 1-2 pm Thursday 1-2 pm
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Graders
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Ivy Li and Zhengyu Wan
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Email
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ili@ucsb.edu and zwan@ucsb.edu
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Course Description:
Electrodynamics, Maxwells equations,
conservation laws, electromagnetic waves, potentials and
fields for moving charges, radiation, special relativity.
Textbook:
Introduction to
Electrodynamics, Griffiths, 5th
edition. Same as 110A (amazon
link).
The 4th edition is also fine.
I will be (mostly?) assigning homework problems from
the book (5th edition).
I need to know if there are students with the 4th
edition, so that I can pick problems that are in both
the 4th and 5th edition.
Additional
Material
- Wire size vs. current
- In the January 16 lecture we talked
about the fact that magnetic forces do no work on charges,
because the magnetic force q v x B is
perpendicular to the velocity and therefore perpendicular
to the displacement. There are some interesting
examples in Griffiths Chapter 8.3. In the Fall
version of the class I went through the first of these
examples (Example 8.5 page 380 in the 5th edition and
described at the bottom of page 373 in the 4th
edition). As I said in class, I had trouble
understanding the technique he used to solve the
problem. This quarter I have decided to skip this
subject to save some time for later. But it is
interesting, here
is a writeup from last quarter that explains Griffith's
method (it also shows an alternative derivation).
- January 24: how
to use Kirchoff's voltage law in a circuit.
- January 29: About
polarization of reflected and transmitted waves: here.
Homework:
Homeworks should be turned in via Gradescope.
Code: TBD
Note: the number of interesting/good E&M problems that one
come up with is somewhat limited.
If you search hard enough on the web, you are likely to be
able to find solutions to many of the assigned problems (or
to very similar problems). Apparently, the latest
version of ChatGPT can actually solve hard, graduate level,
E&M problems (!).
My recommendation is that you try hard to do the problems
yourself, or with your study group.
If you do end up getting help from the internet or other
sources, make sure you understand the solution, do not
just copy it down. Maybe just take a hint to get started
and then finish things by yourself.
To be clear: I am not encouraging you to do this, but I
recognize reality, and I also think that there is some learning
value
in looking things up, but only after you have made a good
effort. Careful: do not overdo it! Remember that in
the end you
will need to solve exam problems all by yourself.
In any case: if you get help with your homework from any source
(internet, friends, study group...), make a note of
it with your solution. You will not be penalized in any
way, but honesty is always good.
| Homework
Number |
Due
date |
Problems |
Solutions |
| 1 |
Friday, January 17, 11:59
pm
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here
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here
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| 2 |
Friday, January 24, 11:59
pm |
here
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here
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| 3 |
Friday, January 31, 11:59
pm |
here
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here
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| 4 |
Friday, February 7, 11:59
pm
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here
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here
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| 5 |
Note non-standard
due date
Sunday, February 16, 11:59 pm |
here
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| 6 |
Friday, February 21, 11:59
pm |
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| 7 |
Friday, February 28, 11:59
pm |
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| 8 |
Friday March 7, 11:59 pm
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9
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Friday March 14, 11:59 pm
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Discussion Session Materials
Attendance to discussion session is not mandatory.
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Date
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Questions
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Solutions
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1
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January 9
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here
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here
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2
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January 16
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here
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here
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3
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January 23
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here
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here
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4
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January 30
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here
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here
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5
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February 6
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here
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here
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6
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February 13
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Review midterm questions
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7
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February 20
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8
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February 27
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9
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March 6
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10
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March 13
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Exams and Grading:
There will be one midterm and one final.
The midterm will be on Tuesday,
February 11 during normal class time.
The final will be Wedesday,
March 19, 12-3 pm.
The final grade for this class will be calculated from a curve
based on your scores on the Homework (15%), Midterm (35%),
Final (50%).
For an example on how I previously arrived at the letter
grades for a class, see this link.
If you miss the midterm for a good reason (eg: illness), your
letter grade will be calculated based on the homework and final
only.
If you miss the final you will be given an incomplete. You
will take the Physics 110B final the next time that the class is
being offered.
If, on the other hand, this is your last class that you need to
graduate, we'll figure it out, somehow.
Tentative
Schedule (TBD):
Sections from Griffiths
Week of Jan 6
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7.1 7.2.1 7.2.2
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Week of Jan 13
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7.3.1 --> 7.3.5 8.1
8.3 (just the concept, see 'Additional Material' entry)
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Week of Jan 20
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8.2.2 (skipping the ugly vector algebra)
8.2.3
9.1.1 9.1.2 9.2.1 9.2.2 9.2.3
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Week of Jan 27
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7.3.6 9.3 See also "Additional
Material" entry dated January 29.
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Week of Feb 3
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Tuesday's Lecture: 9.4.1 9.4.2
Thursday's lecture: 9.5.1 9.5.2 (not finished, to be
continued)
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Week of Feb 10
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Midterm week
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