# Wright State University Lake Campus/2019-9/Phy 2410/Notes

PHY2410

### 08-27T (week1) UP2-1-Charges and fields.

UP2-0-Overview UP2-1-Charges and fields. powerpoint pages 1-10

### Lab

Inventory for Kits. Required Report to be done at home.

### 08-29R (week1)

UP2-1-Charges and fields powerpoint

### 09-03T (week2)

Finished UP2-1-Charges and fields powerpoint. Practice for Test Tue 10 Sep up2

### Lab

Practice for test on Tues 10: https://pilot.wright.edu/d2l/le/content/517109/viewContent/2886956/View

### 09-05R (week2) UP2-2-Gauss Law

Start powerpoint UP2-2-Gauss Law powerpoint

### 09-10T (week3)

Test 1

#### Lab

Go over test?

Report longer than a half page.

Do assigned circuit

Make a quick circuit diagram.

Most important part: Document with greek letters.

Thursday:

Group reports encouraged.
You must do the assigned circuit, unless you choose to do no circuit.
Most of the time, you can do a report on something else.
Choices: Previous test or Area of a sphere using calculus.

These images illustrate the physics version of spherical coordinates on a globe (angular part only)]]

### 10-08T (week7)

Announce test next Tuesday:

Wright State University Lake Campus/2019-9/Phy 2410#UPCOMINGTues_15_October or
https://pilot.wright.edu/d2l/home/517109

_____

2. Do a first order approximation (whisky-cigar w/o the cigar) and compare the answers.
3. Can you define an intrinsic variable for the bent/wrinkled tape?

Set the radius at the free-throw be nominally R= 2m and let the tape width be W=4cm. Express all your equations using the symbols (R,W) in order to app

### 10-10R (week7)

#### Lab and Recitation Hours

Algebra
• Lab1 110 min
• Rec 55 min
• Lab2 110 min
110<Total<275

Note that 275/5 = 55

55-10 = 45 minutes

Lets do projects and split into 5 groups
Lab1 45 min (X 2 shifts)
Rec 45 min
Lab2 45 min (X 2 shifts)

Halfway between 3:20 and 5:20 is 4:20

Two lab periods every day
3:20 - 4:20 You can come 15 minutes late or leave 15 min early.
4:20 - 5:20 You can come 15 minutes late or leave 15 min early.
Recitation group
5:30 - 6:25 You can come 10 minutes late or leave 10 min early.
We will have 5 groups
1. Early Tuesday Lab
2. Late Tuesday Lab
3. Recitation Tuesday
4. Early Thursday Lab
5. Late Late Thursday Lab

#### Projects

The goal of each project is co-authorship on the Lake Campus Research Symposium

##### Mathematical physics
1. Why ${\displaystyle 1+2+3+...=-{\tfrac {1}{12}}}$ is useful if not true
2. Generalizing the Taylor expansion to two dimensions
3. Calculating the area of a sphere and how that eventually led to a precise definition of temperature and entropy
##### Physics 1110 labs
1. Force table w Escel and error analysis
2. Stretching a long string
3. Others are possible

### Charge due to a slab of charge

1 A cylinder of radius, R, and height H has a uniform charge density of ${\displaystyle \rho }$. The height is much less than the radius: H << R. The electric field at the center vanishes. What formula describes the electric field at a distance, z, on axis from the center if z > H/2?

 ${\displaystyle \varepsilon _{0}E=\rho z}$ b) ${\displaystyle \varepsilon _{0}E=H\rho }$ c) ${\displaystyle \varepsilon _{0}E=H\rho z}$ d) none of these are correct e) ${\displaystyle \varepsilon _{0}E=H\rho /2}$

2 A cylinder of radius, R, and height H has a uniform charge density of ${\displaystyle \rho }$. The height is much less than the radius: H << R. The electric field at the center vanishes. What formula describes the electric field at a distance, z, on axis from the center if z < H/2?

 ${\displaystyle \varepsilon _{0}E=H\rho /2}$ b) none of these are correct c) ${\displaystyle \varepsilon _{0}E=\rho z}$ d) ${\displaystyle \varepsilon _{0}E=H\rho }$ e) ${\displaystyle \varepsilon _{0}E=H\rho z}$

### 10-15T (week8)

#### Start lab schedule

• Unless I change my mind, you are all allowed to do this lab by doing an assigned lab and the report. The only complication is that I might not have enough "traditional" labs for you to do. I might be forced to make you do one of my projects on one or two lab sessions.
For that reason, I need a list of people who wish to do a project leading to a symposium poster.
• There is a shortage of people who want to do the Thursday late lab (4:25-5:20) due to a difficult class that follows. We will devote that time-slot to a project related to materials, and set aside time for study if you have an exam just after the test.
• I have two "engineering projects":
1. Upside down goggles
2. Gridiron pendulum: wikipedia:Gridiron pendulum and also Lake Campus Gridiron page

### 11-05T (week11)

We will do 7 problems from File:Quizbankqb d cp2.12.pdf

• ${\displaystyle {\vec {B}}=\oint {\frac {\mu _{0}}{4\pi }}{\frac {Id{\vec {\ell }}\times {\hat {r}}}{|r|^{2}}}}$ and the volume integral ${\displaystyle \int {\frac {\mu _{0}}{4\pi }}{\frac {{\vec {J}}\times {\hat {r}}}{|r|^{2}}}d\tau '}$, where ${\displaystyle {\vec {J}}}$ is current density.
• ${\displaystyle \oint {\vec {B}}\cdot d{\vec {\ell }}=\mu _{0}I_{encl}}$ is Ampere's law relating a closed integral involving magnetic field to the total current enclosed by that path.