# Lecture 41: WED 02 DEC Final Exam Review I - PowerPoint PPT Presentation

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

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### Physics 2113 Jonathan Dowling Lecture 41: WED 02 DEC Final Exam Review I – PowerPoint PPT presentation

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

1
Lecture 41 WED 02 DECFinal Exam Review I
2
• 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.
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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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LC Circuits
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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.
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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?
• 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

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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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Q(t)
t(s)
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(31-27)
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Example, Transformer
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Maxwell II Gauss law for B-Fieldsfield lines
are closedor, there are no magnetic monopoles
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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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32.5 Maxwells Equations