## Welcome to PHY 481
### Electrostatics
Prof. Danny Caballero
### Contacting Danny (he/him/his)
Office: 1310-A BPS
Email: <caballero@pa.msu.edu>
### Contacting Bryan Stanley (he/him/his)
Office: 1310-C BPS
Email: <stanl142@msu.edu>
### Important Sites
* Course Webpage: [dannycab.github.io/phy481msu_f2019/](http://dannycab.github.io/phy481msu_f2019/)
* Slack Team: [msuphysics481fall2019.slack.com](http://msuphysics481fall2019.slack.com)
* *Invite link in syllabus*
### Course Activities
* Evening Exams (2 of them) - 20% each
* 1415 BPS; Oct 2 and Nov 6; 7-9pm
* Final Exam (Dec 10: 1415 BPS) - 20%
* Homework (Lots of it; Due on Fridays) - 40%
* Clickers - Extra Credit for Lowest Midterm
[Much more detail on website](http://dannycab.github.io/phy481msu_f2019/)
### Grading Scheme
* 4.0 - 90-100
* 3.5 - 80-90
* 3.0 - 70-80
* 2.5 - 65-70
* 2.0 - 60-65
* 1.5 - 55-60
* 1.0 - 50-55
* 0.0 - Below 50
I do not curve grades.
## Historical Grades in 481
<img src ="./images/481_grades.png" align="center" style="width: 800px";/>
### Clickers
Self-register your clicker
[https://goo.gl/nrebCr](https://tinyurl.com/yxzbrcf6)
Type the 8 digit code on the back of the clicker next to your name. If you can't read the code, please come see me.
**I give you credit for any click.**
### Exam Re-writes
Exams can be very stressful.
* For both Exam 1 and 2, you will be allowed to rework the exams to earn up to 50% of the credit back.
* You will need to rework the exam and turn in a page that addresses what you did incorrectly.
Learning is a social and collaborative act!
### Homework Help Session
**Evening sessions twice per week (1300 BPS)**
Question to you: When should we do this?
1. Wednesday 6-7pm
2. Wednesday 7-8pm
3. Thursday 6:30-7:30pm
4. Thursday 7:30-8:30pm
5. None of these times work
Reminder: Homework is due on Fridays.
How likely are you to attend the help sessions?
1. Very likely
2. Likely
3. Not likely, I really want a different day/time
4. I’m unlikely to attend regardless of schedule
## This Week!!!
* Homework 1 is already up (Due Fri. Sept. 6)
* Read (seriously do this!) Griffiths Ch 1.1-1.4 & 2.1-2.2 [1]
* [Download Anaconda distribution of Python](https://www.continuum.io/downloads)
**Stay up-to-date by checking website, calendar, and Slack regularly.**
[1]: *I am assuming that Ch. 1 of Griffiths is mostly review.*
### Computational Homework problems
* We will be using Python on homework problems this semester.
* Installation instructions will appear on the Slack team site.
* Homework questions will take the form of [a Jupyter notebook](https://github.com/dannycab/phy481msu/blob/gh-pages/jupyter/HW1-GradientProblem.ipynb), which you can print to PDF and turn in.
* If you get stuck somewhere, post on Slack, so your classmates benefit from your question.
* Computational HW problems are turned in via Dropbox file requests. *Look for link at the top of each homework assignment and include your name in the filename!*
### Commitment to an Inclusive Classroom
I am committed to creating an inclusive classroom. If I can do anything to make the classroom a better learning environment for you, please let me know.
If you observe or experience behaviors that violate our committment to inclusivity, please let me know as soon as possible.
If I violate this principle, please let me know or please tell the undergraduate department chair, Stuart Tessmer (<tessmer@pa.msu.edu>).
### Confidentiality and Mandatory Reporting
One of my responsibilities is to help create a safe learning environment. It is my goal that you feel able to share information related to your life experiences. I will seek to keep information you share private.
However, I am required to share information regarding sexual misconduct, relationship violence, or information about criminal activity with the University.
### Confidentiality and Mandatory Reporting
Students may speak to someone confidentially by contacting:
- MSU Counseling and Psychiatric Service (CAPS)
- caps.msu.edu or ph: 517-355-8270
- MSU’s 24-hour Sexual Assault Crisis Line
- endrape.msu.edu or ph: 517-372-6666
- Olin Health Center
- olin.msu.edu or ph: 517-884-6546
### Spartan Code of Honor Academic Pledge
As a Spartan, I will strive to uphold values of the highest ethical standard. I will practice honesty in my work, foster honesty in my peers, and take pride in knowing that honor is worth more than grades. I will carry these values beyond my time as a student at Michigan State University, continuing the endeavor to build personal integrity in all that I do.
### Advice from those who came before you
* Go to class every day and participate in the clicker questions/discussion
* The homework is challenging but very important, don't short cut it
* Start your homework early and spend your time on understanding all of it
* Don't do it alone; form study groups
* Attend the help session, but start the homework first
* Danny is never trying to trick you.
## What do you think PHY 481 is about?
### Electromagnetism is the foundational field theory of physics
Think about everything you already know about electromagnetism (it's a lot already!).
Work with a partner to map out the electromagnetism concepts that you know and how they are related to each other.
<img src ="./images/wamps.png" align="center" style="width: 800px";/>
## Mathematical Preliminaries
$\nabla\cdot\mathbf{E} = \frac{\rho}{\epsilon_0} \qquad \int \mathbf{E}\cdot d\mathbf{A} = \int \frac{\rho}{\epsilon_0} d\tau$
$\nabla\cdot\mathbf{B} = 0 \qquad \int \mathbf{B} \cdot d\mathbf{A} = 0$
$\nabla\times\mathbf{E} = - \frac{\partial\mathbf{B}}{\partial t} \qquad \int \mathbf{E} \cdot d\mathbf{l} = - \int \frac{\partial\mathbf{B}}{\partial t} \cdot d\mathbf{A}$
$\nabla\times\mathbf{B} = \mu_0\mathbf{J} + \mu_0\epsilon_0\frac{\partial\mathbf{E}}{\partial t} \qquad \int \mathbf{B} \cdot d\mathbf{A} = \mu_0 \int \left(\mathbf{J} + \epsilon_0 \frac{\partial\mathbf{E}}{\partial t}\right) \cdot d\mathbf{A} $
Note:
There's a reason that we are starting with vectors and vector operations; it's inherent in the way electromagnetism is described!
<img src ="./images/charges_in_plane.png" align="right" style="width: 350px";/>
Two charges +Q and -Q are fixed a distance r apart. The direction of the force on a test charge -q at A is...
1. Up
2. Down
3. Left
4. Right
5. Some other direction, or $F = 0$
Note:
* CORRECT ANSWER: A
* Use superposition
* Fall 2016: [71] 14 3 8 5; Second vote (after discussion): [98] [2] 0 0 0