Wright State University Lake Campus/2019-5/Phy 2410/Notes

Wright State University Lake Campus/2019-5/Phy2410/Announce

Monday 5/13

 * Organization
 * Pick a schedule. The official course calls for 6 hours per week. Five hours per week will be graded as lab/quiz time, and one hour will be awarded extra credit.  Strong students might be able to miss more days.
 * Would it be possible to for every student to attend half of the 3:30-4:30 time slot for a quiz on MW?


 * First test this Friday (see for Calandar for entire test schedule)
 * Today's lab-learning python
 * Decible scale problems using copyAndRename.py and DoNotEdit.py. First look at some sandbox codes:
 * sandbox1
 * sandbox2
 * user:Guy vandegrift/S/3

F 5/17 T1̇̇***
Vol 2 Chapter 5: Electric Charges and Fields  Electric Charges and Fields StudyAll

You must learn the essential questions to pass this course with a C.

After test: Start Gauss's Law for test next Friday.

Monday 5/20

 * 1) Talked about flux over the surface of a volume (closed surface)
 * 2) Cut Mobius strip in half
 * 3) Did d_cp2.6 and just started c19ElectricPotentialField_GaussLaw
 * 4) Wed we will try to do c19ElectricPotentialField_SurfaceIntegral

5/22
https://slideplayer.com/slide/12186186/72/images/44/Example%3A+Find+the+electric+field+of+a+slab+of+nonconducting+material+forming+an+infinite+plane+.It+has+thickness+d+and+carries+a+uniform+positive+charge+density+r.jpg

https://slideplayer.com/slide/12186186/

You can use this date for your report:

Be sure to state that this is fake data that was generated using a random number generator because we forgot to save our actual data.

F 5/24 T2***
Old solutions -StudyQuestions.pdf-(all) - OpenStax V2

Try to get examples 6.1, 6.3, 6.4

Monday 5/27
2 Chapter 7: Electric Potential

5/31
Work on:

Labs/Lecture/HW
Wright State University Lake Campus/2019-5/Phy 2410/Labs

6/5 W T4***
This is a (planned) test:

After the test we will try to work on this:

Cell membrane
In particular, we will look at Capacitor to understand energy storage using differentials. Then we will check d_cp2.8 #4 to see if maybe it was right.

Conventional (and correct) wisdom is that there are four fundamental forces. But as a practical matter, there is: gravity, electro-magnetic, chemical, and what might be called "mechanical". These mechanical forces include tension, friction, and the normal force. These mechanical forces, as well as the "chemical" force are for the most part electromagnetic: It is the electrons that prevent you from walking through walls and closed doors, and their force is largely electrostatic. An important chemical force is related to something called the "chemical potential", discussed in this Khan Academy unit. String tension best viewed as a mysterious "mechanical" (not electrical) force, it is best to view the force exerted by ATP in the cell as sort of a "mechanical" force because it is a really complicated way we use food to maintain the proper balance of ions inside and outside a cell, and ultimately control our muscles.

The membrane of a biological cell is essentially a capacitor, and there is an obvious electrical force (and associated potential) that pushes positive and negative ions between the intra- and extra- cellular environments. Also important is the electrochemical gradient, caused by an abundance of one species in one of the environments. See also: Electrochemical gradient - Active transport - The electrochemical gradient consists of two parts, the chemical gradient, or difference in solute concentration across a membrane, and the electrical gradient, or difference in charge across a membrane.

Monday 6/10 T5***
Another test:

6/14
2 Chapter 11: Magnetic Forces and Fields

W 6/19 T6***
N.B.: on pdf 16, question 9 is not on the test. Also the resistors are in series for question 2. Test T6 postponed till Friday. OpenStax:Vol.1 - Vol.2 - Vol.3

Monday 6/24 T7***
T7 will be on Monday 6/24 so we can stay on schedule. After this, (starting with T8), exams will begin to cover review material. Expect lower scores, but do not worry: All members of this class have demonstrated an ability to pass this course. The "harder" tests will be used to distinguish between the passing grades ... all you need to do to pass this course is continue to do well on the new "essential" questions. OpenStax:Vol.1 - Vol.2 - Vol.3

6/28
2 Chapter 14: Inductance

Monday 7/1 T8***
Monday 7/1 T8*** OpenStax:Vol.1 - Vol.2 - Vol.3

7/5 T9***
F 7/5 T9*** OpenStax:Vol.1 - Vol.2 - Vol.3

7/10 T10 ***
OpenStax:Vol.1 - Vol.2 - Vol.3

7/12 T11***
OpenStax:Vol.1 - Vol.2 - Vol.3

Monday 7/15 T12***
OpenStax:Vol.1 - Vol.2 - Vol.3

7/17
Assume that A (SI unit: m2) is a small surface centred at a given point M and orthogonal to the motion of the charges at M. If I$A$ (SI unit: A) is the electric current flowing through A, then electric current density j at M is given by the limit
 * Review current density as current per square meter:


 * $$j = \lim\limits_{A \rightarrow 0}\frac{I_A}{A},$$

with surface A remaining centred at M and orthogonal to the motion of the charges during the limit process.S
 * Ampere's law with H:
 * {| class="wikitable" style="text-align: center;"

! scope="col" style="width: 15em;" | ! scope="col" | Integral form ! scope="col" | Differential form
 * + Forms of the original circuital law written in SI units
 * Using $B$-field and total current
 * $$\oint_C \mathbf{B} \cdot \mathrm{d}\boldsymbol{l} = \mu_0 \iint_S \mathbf{J} \cdot \mathrm{d}\mathbf{S} = \mu_0I_\mathrm{enc}$$
 * $$\mathbf{\nabla} \times \mathbf{B} = \mu_0 \mathbf{J} $$
 * Using $H$-field and free current
 * $$\oint_C \mathbf{H} \cdot \mathrm{d}\boldsymbol{l} = \iint_S \mathbf{J}_\mathrm{f}\cdot \mathrm{d}\mathbf{S} = I_\mathrm{f,enc} $$
 * $$\mathbf{\nabla} \times \mathbf{H} = \mathbf{J}_\mathrm{f} $$
 * }
 * $$\mathbf{\nabla} \times \mathbf{H} = \mathbf{J}_\mathrm{f} $$
 * }

What the ...?
 * $$\mathbf{B} = \mu \mathbf{H},$$

where $μ$ is a material dependent parameter called the permeability. In some cases the permeability may be a second rank tensor so that $H$ may not point in the same direction as $B$. These relations between $B$ and $H$ are examples of constitutive equations. However, superconductors and ferromagnets have a more complex $B$-to-$H$ relation; see magnetic hysteresis.

Monday 7/22 T13

 * https://www.instructables.com/id/Upside-down-glasses/
 * c:User:Guy vandegrift/Simple optics
 * c:User:Guy vandegrift/Harmony

OpenStax:Vol.1 - Vol.2 - Vol.3

7/31 W FE
Textbook:Vol.1 - Vol.2 - Vol.3

Wed and Friday: July 24, 26
Most of the time will be devoted to the Eye Model Lab. The report is due on the last day of class (Wed 31 July).

Monday 29 July: Test
Test covers two topics:

Maxwell's equations
Application of surface and line integrals (Gauss, Ampere, and Faraday laws, as well as convection current). Questions will be taken from the following list. And you will be asked to apply how one of the integration laws to a simple geometry that has already been discussed in class.

Wed 31 July: Report due and required lab activity
The report on the lab we did with a real image. The lab activity is required and to be arranged. We might work on the application of calculus to physical problems.

You can use this date for your report:

Be sure to state that this is fake data that was generated using a random number generator because we forgot to save our actual data.

Maxwell's equations for simple geometries

 * Electric field: Point charge (spherically smmeric), line charge (cylindrical symmetry), or large flat plate (capacitor).
 * https://web.pa.msu.edu/courses/1997spring/PHY232/lectures/ampereslaw/wire.html Ampere's law: long straight wire]
 * Magnetic field of a solenoid
 * Magnetic field of a toroid

- Old solutions -StudyQuestions.pdf(all) - Textbook:Vol.1 - Vol.2 - Vol.3