exam1_sol - Physics 2020—002 Name; Kev Exam 1A # 8...

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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 parallel-plate 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 t-L.,.,_.~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 10-6 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 10-2 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 10-19 c 5.25 x 10-17 C c) 3.24 x 10-12 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 10-15 c b) 1.60 x 10-19 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 Frank-05h a) Newton b) Coulomb c) Volta (1) Ohm X PHYS-2020-002: 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 PHYS-2020-002: 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 half-way 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 PHYS-2020-002: 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 Q-m, 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 PHYS-2020-002: 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.

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exam1_sol - Physics 2020—002 Name; Kev Exam 1A # 8...

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