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Title: Lecture 41: WED 02 DEC Final Exam Review I


1
Lecture 41 WED 02 DECFinal Exam Review I
2
The Grading
  • Midterms  -  100 points each
  • Final Exam  -  200 points
  • Homework   -  75 points
  • In Class PP - 25 pointsTOTAL 600 points
  • Numerical Grade Total Points / 6

3
A 98-100 A
92-97 A- 89-91
B 86-88 B 78-85
B- 75-77
C 72-74 C 63-71
C- 60-62 D
57-59 D 53-56
D- 50-52 F
lt50
4
Final Exam
  • 300PM 500PM MON 07DEC

PHYS 2113-1 (Moreno) is scheduled to take their
exam in Lockett 9 PHYS 2113-2 (Gaarde) is
scheduled to take their exam in Lockett 10 PHYS
2113-3 (Dowling) is scheduled to take their exam
in Lockett 6 PHYS 2113-4 (O'Connell) is
scheduled to take their exam in Lockett 15 PHYS
2113-5 and 6 (Abdelwahab) is scheduled to take
their exam in Lockett 2 PHYS 2113-7 (Hansen)
Last name starts with A - K take their exam in
Lockett 10, last name starts with L - Z take
their exam in Lockett 2
5
Final Exam
  • 100 PTS CH 13, 2130 / HW01-11This part will be
    11 multiple choice questions one from each
    chapter.
  • 100 PTS CH 3133 / HW12-14This part will be
    three multiple choice questions and three word
    problems, one each from each chapter.

6
  • What do you need to make on the final to get an
    A, B, C, etc.?
  • A 90100      B 7589      C 6074      D
    5059      F lt50
  • Solve this simple equation for x

Where mt1exam1, mt2exam2, mt3exam3, hwtotal
points on your hws0114 (out of 472),
icppcchecks, icppxXs, icppnumber of times you
were called on, max is the binary maximum
function, and y is your desired cutoff number, y
90, 75, 60, or 50. Then x is the score out of
200 you need on the final to make that cutoff
grade y. This assumes no curve.
7
Example John Doh wants to know what he needs to
make on the final in order to get an A- 89 in
this class.
It is very likely impossible for John to get an
A- as hed need better than a perfect score on
the final. How good does he need to do to avoid a
C 74?
John is extremely unlikely to get an A, and is
unlikely to get a C, so the most probable outcome
is that John will get a B in this class.
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10
LC Circuits
11
PHYS2113 An Electromagnetic LC Oscillator
Capacitor initially charged. Initially, current
is zero, energy is all stored in the E-field of
the capacitor.
A current gets going, energy gets split between
the capacitor and the inductor.
12
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13
Electric Oscillators the Math
Amplitude ?
Voltage as Function of Time
Energy as Function of Time
14
Example
  • In an LC circuit, L 40 mH C
    4 µF
  • At t 0, the current is a maximum
  • When will the capacitor be fully charged for the
    first time?
  • ? 2500 rad/s
  • T period of one complete cycle
  • T 2p/? 2.5 ms
  • Capacitor will be charged after T1/4 cycle i.e
    at
  • t T/4 0.6 ms

15
Example
  • In the circuit shown, the switch is in position
    a for a long time. It is then thrown to
    position b.
  • Calculate the amplitude ?q0 of the resulting
    oscillating current.
  • Switch in position a qCV (1 mF)(10 V) 10
    mC
  • Switch in position b maximum charge on C q0
    10 mC
  • So, amplitude of oscillating current

0.316 A
16
Damped LCR Oscillator
  • Ideal LC circuit without resistance oscillations
    go on forever ? (LC)1/2
  • Real circuit has resistance, dissipates energy
    oscillations die out, or are damped
  • Math is complicated! Important points
  • Frequency of oscillator shifts away from
  • ? (LC)-1/2
  • Peak CHARGE decays with time constant
  • tQLCR2L/R
  • For small damping, peak ENERGY decays with time
    constant
  • tULCR L/R

C
L
R
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18
Q(t)
t(s)
19
(31-27)
20
Example, Transformer
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23
Maxwell II Gauss law for B-Fieldsfield lines
are closedor, there are no magnetic monopoles
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25
Displacement Current
Maxwell proposed it based on symmetry and math
no experiment!
i
i
E
Changing E-field Gives Rise to B-Field!
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28
32.5 Maxwells Equations
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