* * * E & M * * *
(a Saint Ann's Study of) * * * I & P.* * *
2018 - 2019
Daniel A. Martens Yaverbaum
Note:
LAST UPDATED 1:50 am, October 16, 2018
Please continue to 'black-out' 2:45 PM TO 5:50 PM EVERY TUESDAY (F2018 - S2019).
but NOTE:
5:25 PM - 5:49 PM IS LECTURE-GRACE-PERIOD/HALF-OFFICE-HOUR.
BY 3:00 PM, WE ARE FULLY IN MOTION !
To : Use https://classroom.google.com/u/0/h, CLASSROOM CODE: r68ffkn
DATE
#
LECTURE
Pre- READING
ASSIGNMENT
FINDING
Tuesday,
SEPTEMBER 11
2018
1
Case Study 1
from
Classical Mechanics
('
Physics 203'):
or some roughly equivalent
calculus-based study in Classical Mechanics.
Refresh yourself with this fundamental material. Make sure you are particularly ready to go with :
The Conservation of Energy &
Conservative Forces, esp.:
1. The P204 way to
consider ENERGY
(when conserved):
A characteristic
(combination of measurements)
that holds constant
from PLACE to PLACE
while a system
continues to
exhibit signficant,
yet
symmetric,
changes over time.
*PLUS this variation on Problem 9: Assume the mass of this oscillator is 30 kg. If an ideal spring is causing the
simple harmonic oscillation, find the spring constant (K).
Our two paths from
Physics 203
to Physics 204, i.e.:
from
'characters that go'
to
'characteristics that flow':
The videos above are from Khan Academy. We will NOT use Khan's method for deriving
Doppler equations, but the conceptual introduction (first video) & the animation (second video) are very helpful.
THEN read: HRW, Chapter 17 (Waves-II): 17-1 (Speed of Sound), 17-7 (The Doppler Effect) 17-8 (Supersonic Speeds)
Resonance & Volume
Skip part II, question B and part III, questions A & B. They will be due on Wednesday.
JANUARY 8
14
Gravitational
action-at-a-distance;
a letter to Sir Bentley;
the electrostatic force
JANUARY 15
15
Two ways to Multiply Vectors
The e, the e-Charge, &
the e-Force
READ in HRW: Chapter 21 (Coulomb's Law)
(Don't stress about section 22-3; all you really need to know is the title: charge is conserved.)
Chapter 22 (Electric Fields)
You do NOT need to read these 2 sections: 22-5 (E. Field Due to Charged Disk), 22-7 (Dipole in E-Field)
In 22-6, the improtant part is the opening two paragaphs. All that stuff about "Measuring the Elementary Charge"
and "Inkjet Printing" is cool, but not required reading
That's a bunch of reading. Leave time for it.
HW 13:
Interference & Power
This is an expansion and elaboration of the questions we skipped from HW 10.
Problem 13 is a CHALLENGE PRBOLEM.
Here's a HINT: the y coordinate will have to be zero.
The reason is that, if the two forces cancel, they must be exactly opposite, i.e. colinear.
This is only possible if the three point-charges are all in a row.
(HW 13 was posted late, so it's optional, but it will be useful for exam prep & you can get points
for it if you hand it in.)
READ in HRW:
Chapters 24 & 25
You can skim/skip some parts of these chapters. Here are the important sections: 24-1 (Electric Potential), 24-2 (Equipotential Surfaces & etc.)
24-6 (Calculating Field from Potential) 24-8 (Potential of Charged, Isolated Conductor)
25-1 (Capacitance)
HRW: Chapters 28 & 29.
Read on the following sections:
28-1 (Magnetic Fields and the definiton of B)
28-6 (Mag Force on Current-Carrying Wire)
29-1 (Magnetic Field due to Current)
29-2 (Force Between Parallel Currents)
29-3 (Ampere's Law)
HRW: Chapters 27, 30 & 32.
Read on the following sections:
27-4 (RC Circuits)
30-1 (Faraday & Lenz)
30-3 (Induced Electric Fields)
32-1 (Gauss's Law for Magnetic Fields)
32-2 (Induced Magentic Fields)
32-3 (Displacement Current)
These homeworks are here if you want a little extra practice. They are NOT going to be collected.
3D Electric Field Line Simulator
(Use the drop-down menus on the left to switch the display from "particles" to "field lines" and to try different charge configurations.)