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Unformatted text preview: Physics 2020—002 Name; Kev
Exam 1A # 8 February 2010 Part A: Hard Multiple Choice (10 points total, 2 points each, Circle Best Answer). 1. A plate in a parallelplate capacitor has a surface area of 2.45 X 10—4 In2 and a plate separation
of 1.88 111111. This capacitor has a dielectric and a capacitance of 5.40 pF. What is the dielectric
constant of this dielectric? a) 1.15 X 10—12 b) 1.15 X 10—3 pF 4 5.40 4.69 e) 120 pF
5 _ A (5‘. oxlo‘lf:§ “gag/0‘ rm}
menace/ML tL.,.,_.~L.h_._.,_ ..
C a / 3 GOA— (3.55’¥l0 lqel/NMZ§<2.LI§XID_ M13  4“ ' 2. An alpha particle ion with a charge of +26 experiences a force of 2.67 X 10—12 N as it moves
through an electric field. What is the strength of the electric ﬁeld? @333 x 106 N/C b) 3.83 x 106 we 0) 9.11 x 10412 N/C
d) 1.67 ><109 N/c e) 1.67 ><1023 N/C
— Fe 9 67x lam—,0 6
zl‘ : .————:2, ’ 7‘ «BBX/D /\8 ’
L— 6 /9F 88 «lowly/04%) a /C' 3. \Nhen a resistor has 2.33 1nA ﬂowing through it, it experiences a voltage drop of 0.112 V. What
is the resistance of this resistor? a) 4.31 x 102 n b) 0.261 n c) 2.33 o @531 o e) 102 n
2 AV ,_ o. II2\/
R ~— 2 42. 1.0. I ~ gnaw/0'3 A
4. A proton (q = e) experiences an attractive electric force of 2.88 X 10‘16 N When it comes to
Within 16.2 run of an unidentiﬁed particle. What is the charge on this unidentiﬁed particle? a) 1.60 x 1019 c 5.25 x 1017 C c) 3.24 x 1012 C d) 3.28 x 102 c e) 2.02 X 107 C Z
963 ' ’ 7” a “'(‘N . o“ _ «17
Fezgae ?3_®: re; (23‘32410 5C”: 2.)” M3 “gage/KID C
e 92 : (gfl'c/xioq 713,,"17CZSZ Lewd/0”” CS 5. A particle produces a potential of 2.88 x 10—4 volts a distance of 0.222 in from the particle.
What is the charge on this particle? V: gig“ _ r 4
a) .11 x 1015 c b) 1.60 x 1019 c 0) 362a at: \/r (1%“ O VBQLVRMS 31: = 22.27401 MM‘7C2) : 79HXID.’$C d) 5.666 e) 8.99 X 1.0—6 C Part B: Easy Multiple Choice (10 points total, 1 point each, Circle Best Answer).
6. Three capacitors are parallel in a circuit, which of the following must be true? @The sum of the charges on each capacitor must equal the charge on the “equivalen ” capacitor
in the reduced circuit. b) Each capacitor must have the same charge on it. c) The sum of the potential drop of each capacitor must equal the voltage gain of the supplying
battery. d) Each capacitor must have the same capacitance. e) The sum of the reciprocal capacitance on each capacitor must equal the reciprocal capaci—
tance of the “equivalen ” capacitor in the reduced circuit. 7. An electron lies on the origin of a Cartesian coordinate system. A helium nucleus (q = 26) lies
at —3.2 m on the :3 axis. A proton lies at +3.2 in on the :1: axis. Which direction will the electron move?
W2“> aw
332M 3.1M 8. Assume we have a charged object where electric ﬁeld lines ﬂow radially out of the object. Such
an object would then be called a(n) @lectric monopole d) magnetic dipole e) none of these /‘ FTOT
+28 4‘ "e 9 b) +13 0) —y d) +y b) magnetic monopole c) electric dipole e) electric quadrapole 9. Who was the ﬁrst to realize that charge comes in only two varieties, positive and negative? @none of these Frank05h a) Newton b) Coulomb c) Volta (1) Ohm X PHYS2020002: General Physics II — Exam 1A — 8 February 2010 Page 3 10. If an E—ﬁeld in the Earth’s atmosphere exceeds the dielectric strength of the atmosphere, which
of the following will occur? a) rain storm b) fog @lightning d) rainbow e) sunset 11. Charge exchange between two isolated objects resulting from the generated electric ﬁeld is
called a) advection b) accretion @nduction cl) convection e) conduction 12. The expression AV = I R is known as a) Coulomb’s law b) Ampere’s law @hm’s law d) Kepler’s law e) Gauss’s law 13. Which of the following physicists formulated the force law between two charges? a) Volta b) Galileo 0) Newton d) Gauss Coulomb 14. What is the name of the device that transfers charge from a charged source to a large dome
by means of a rotating belt? a) Coulomb belt @Van der Graaff generator 0) galvanometer cl) Ainpere motor e) Millikan oil—drop belt 15. The equation (DE = (2111/60 is called whose law? a) Newton’s b) Coulomb’s c) Volta’s cl) Ohm’s @mne of these Gauss ‘5 PHYS2020002: General Physics II — Exam 1A — 8 February 2010 Page 4 Part C: Problems (20 points total, 10 points each). 16. In the ﬁgure below, let Q1 = +6.84 MC, Q2 2 l6.2 MC, and Q3 = +9.20 MC be rigidly ﬁxed
and separated by 712 = r13 = 7'23 2 1.34 m. Calculate the electricypotential at point P Which
is halfway between Q1 and Q2. (Show all work!) I
(11} r}: M070“ ; 6‘ i ,2 i l  arm I'  \
r1”: :2: (:1 " 0° rm',’ I \‘r23
7"? ((0 lg Q 2 'V; 2 M C i V?» Q1 P Q2
W
& QL Q5 1'12
V: 9ae ——— + _.——— + __————
F, w7, P?)
M( WHO? A3435 (mew/o c 4 (ﬁle zxzo' c3 9120MD‘4’C
‘ 3" CZ emom ewom Hem 543x/O4 \/ H PHYS2020002: Genera] Physics II — Exam 1A — 8 February 2010 Page 5 17. A gold wire of length 13.7 cm and diameter 0.188 mm is going to be used to construct a
thermocouple. Gold has a temperature coefﬁcient of resistivity of 3.40 x 10—8 °C_1. (a)
At 200°C, gold has a resistivity of 2.44 X 10—8 Qm, what is the resistance of this wire
at this temperature? (b) After constructing our thermocouple, we place it into a liquid of
unknown temperature and apply a voltage across the leads of the termocouple of 0.224 V. If
we measure a current of 0.884 A going through this thermocouple, what is the temperature
of this liquid in OC? (Show all work!) c3, _‘
[x =3,40y/D '2' D: _ o
WWI ( l p :2n44X/D%AM3 T=520.0c_
W l K
1: 1mm :7? :g(i:%%X/D.L/MXL
AZ 7.
: 2,73X/D 4’"!
L *8 a l37/M
= I : .0.
as R p A (am/Mo m5 Nix/030441
: DJlDJL : Ro 6* 1032032 T: ,0 Jr 0 :ﬂwoﬂ 0,153A—a/zon.
0(’20 (3940x/o“5t>c”' (oi/loﬁ—B '1 0.0 0 ’
2 OC+3QEC / 34/61 PHYS2020002: General Physics II — Exam 1A — 8 February 2010 Page 6 Extra Credit Problem (5 points, do this only if you have time). 18. Two protons are near the surface of the Earth. The ﬁrst proton is placed securely on the
ground. How high Will the second proton have to be placed in order to just remain stationary above the Earth’s surface? Think about the two forces that would be involved. Show
all work!) /I\ F 3 r1: Q7688 : 8 6 We mg 1 P ” “ /(g‘glx ’OquZ/CL>(1°¢OZ></leqc L
8 MP3 (Mﬂzx may? >(ﬁm MARS ‘1‘ Dell? M ...
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This note was uploaded on 03/21/2012 for the course PHY 2020 taught by Professor Staff during the Fall '08 term at University of Florida.
 Fall '08
 Staff

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