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(G1) Electric Potential and Capacitance PHY 202 Student Code: nature
Electric Potential
NETVK A uniform electric field is oriented toward the right and has magnitude 58 N/C. () In which directionˍ will the electron move once it is released at rest? (*) Find the speed of the electron after it has moved 0.25 m. (Note: The mass of an electron isˍ 9.11 × 10−31^ kg and its charge is −1.6 × 10−19^ C.)
- direction A. left B. right /--/
- speed A. 3415000 m/sˍ D. 3627000 m/sˍ B. 3248000 m/sˍ E. 4273000 m/sˍ C. 2257000 m/sˍ /--/ F. 1847000 m/sˍ JSJJP Suppose 𝑞 1 = 4.7 ˍμC, 𝑞 2 = -7.9 ˍμC, 𝑑 1 = 0.39 m,ˍ 𝑑 2 = 0.59 m, andˍ 𝐿 = 0.82 m. Then find the electricˍ potential at the X.
A. -27920 voltsˍ D. -28750 voltsˍ B. -23800 voltsˍ E. -27080 voltsˍ C. -25990 voltsˍ F. -25190 voltsˍ /--/
IXMJL If a 4.0 μC the electric potential at (
A. charge is located at the origin and a -6. μ C 0.14 m, 0.56 m). 1610 Volts charge is located at 0.80 m on the x-axis, then find D. 4211 Volts B. -4874 Volts E. 5103 Volts C. -4180 Volts F. -3049 Volts /--/ IXMJG A point charge has a charge of 0.0045 C. At what distance from the point charge is the electric potential 18.0 V?
A. 2.538E+06 m D. 2.250E+06 m B. 2.308E+06 m E. 2.544E+06 m C. 2.472E+06 m F. 1.774E+06 m /--/
Capacitance IXMJF
A capacitor has a capacitance of 17.8 ˍμF. A positive amount of charge 𝑄 is placed on one plate of the capacitor (then −𝑄 is on the other plate) so that the potential difference between the plates is 28.9 Volts. Find the amount of chargeˍ 𝑄.
- 𝑄 = A. 348.1 ˍμC D. 647.8 ˍμC B. 287 ˍμC E. 514.4 ˍμC C. 882.9 ˍμC F. 731.4 ˍμC /--/ IXMJJ What is the capacitance of a parallel-plate capacitor with area 2.8 dm² if the separation between theˍ plates is 0.4 m? Then suppose a dielectric with constant 2.2 is placed between the plates of the capacitor.ˍ What is the resulting capacitance? Use 𝜖 0 = 8.85E-12 C²/N·m².ˍ
𝐶 1 = 170 ˍμF, 𝐶 2 = 100 ˍμF, 𝐶 3 = 160 ˍμF, 𝐶 4 = 100 ˍμF
A. 87.05 ˍμF D. 79.88 ˍμF B. 82.83 ˍμF E. 77.07 ˍμF C. 90.35 ˍμF F. 74.53 ˍμF /--/ POXYX Use the capacitances given below to find the equivalent capacitance. 1
(G2) Current and Resistance PHY 202 Student Code: nature IYFNI A beam of protons at an accelerator creates a current of many protons strike the target in 30.0 s?
A. 1.902E+ 120 μA. If the beam is focused on a target, how D. 2.25E+ B. 2.266E+16 E. 2.082E+ C. 2.044E+16 F. 2.3E+ /--/ IYFNN Suppose a 3.0 Volts potential difference is placed across a resistor and the resulting current is 4.0 A. Then what is the resistance of the resistor?
A. 0.7500 Ω D. 0.8121 Ω B. 0.6155 Ω E. 0.5758 Ω C. 0.6710 Ω F. 0.7846 Ω /--/ PPVNX A sample of nichrome wire with cross-sectional diameter 3.2 mm and resistivityˍ 1. m is to be used in winding a coil. If the coil will have a resistance of 31 ˍΩ, then find the length of wire you must use to wind the coil.
A. 172.6 mˍ D. 188.2 mˍ B. 147.3 mˍ E. 178.7 mˍ C. 166.2 mˍ F. 156.9 mˍ /--/ PPRFM At room temperature, about 20°C, aluminum has resistivity 𝜌 m. Find the resistance of an aluminum wire at this temperature if the wire is 60 m long and has diameter 0.11 mm.ˍ ˍ
electrons A. [ 3.949E+22 ] D. [ 3.33E+22 ] B. [ 3.673E+22 ] E. [ 4.24E+22 ] C. [ 3.77E+22 ] F. [ 3.713E+22 ] /--/ IYFNQ If electrical energy costs 12 cents per kilowatt-hour, then how much does it cost to burn a 100-W light bulb for 24 h? Also, how much does it cost to operate an electric oven for 5.0 h if it carries a current of 20 A at 220 V? [SV E08 17.34]
light bulb cost A. 0.2880 dollars D. 0.2809 dollars B. 0.2568 dollars E. 0.2479 dollars C. 0.3401 dollars F. 0.2531 dollars /--/
oven cost A. 2.874 dollars D. 2.640 dollars B. 3.255 dollars E. 2.349 dollars C. 2.782 dollars F. 2.535 dollars /--/
(G3) GW_DC Circuits PHY 202 Student Code: nature IZGHK A chemical battery with EMF 12 V has an internal resistance of 6.6 Ω. What will be the voltage of the battery if it is connected to a 275 Ωload?
A. 9.861 V D. 10.09 V B. 11.72 V E. 9.912 V C. 13.87 V F. 10.21 V /--/
A. 12.91 Ω D. 15.31 Ω B. 19.05 Ω E. 18.97 Ω C. 18.74 Ω F. 12.20 Ω /--/ QCKQM Using the values given below, find the currents 𝐼 1 and 𝐼 2. (You may wish to find 𝐼 3 , too.) 𝑅 1 = 48 ˍΩ, 𝑅 2 = 7.9 ˍΩ, 𝑅 3 = 21 ˍΩ, and 𝑅 4 = 38 ˍΩ 𝑉 1 = 6.4 V,ˍ 𝑉 2 = 15 V, andˍ 𝑉 3 = 3.3 Vˍ IZGHM The diagrammed network can be replaced with a single resistor with what resistance?
- charge after 0.0015 sˍ A. 0.0001923 Cˍ D. 0.00005789 Cˍ B. 0.0001424 Cˍ E. 0.0001391 Cˍ C. 0.00007071 Cˍ /--/
- charge after 1.4 time constants
F. 0.00009644 Cˍ
A. 0.0005556 Cˍ D. 0.0004785 Cˍ
B. 0.0004812 Cˍ E. 0.0003767 Cˍ
C. 0.0007434 Cˍ
F. 0.0006145 Cˍ
IZGHL Suppose R = 290 ˍΩ and C = 110 ˍμF in a (charging) RC-series circuit with a 6.6 V power source. What is ˍ the maximum charge on the capacitor? After 3.1 time constants, the capacitor will reach what percent of its maximum charge?
- max charge A. 0.0006723 Cˍ D. 0.000726 Cˍ B. 0.001006 Cˍ E. 0.0006513 Cˍ C. 0.0005074 Cˍ F. 0.001437 Cˍ /--/
- percent A. 95.57 %ˍ D. 118.2 %ˍ B. 90.64 %ˍ E. 95.5 %ˍ C. 51.64 %ˍ F. 82.69 %ˍ /--/ (G) Test_Electromagnetism 2
PHY 202 Student Code: nature
(G1) GW_Electric Potential and Capacitance
POXXU Suppose 𝑞 1 = 4.2 ˍμC, 𝑞 2 = -7.5 ˍμC, 𝑑 1 = 0.33 m,ˍ 𝑑 2 = 0.6 m, andˍ 𝐿 = 0.88 m. Then find the electricˍ potential at the X.
A. -27660 voltsˍ D. -23160 voltsˍ B. -26330 voltsˍ E. -25280 voltsˍ C. /--/ -23930 voltsˍ F. -22400 voltsˍ IXMJI An electron is 0.040 m from a proton. The proton is at rest, and the electron has velocity 10 m/s toward the proton. What is the speed of the electron when it “falls” to within 0.035 m of the proton? Assume the proton remains at rest throughout this experiment. Note: 𝑚electron = 9.11 × 10−31^ kg.
A. 40.94 m/s D. 49.67 m/s B. 43.10 m/s E. 43.66 m/s C. 50.46 m/s F. 47.05 m/s /--/
IYFNK () Find the resistance in ohms of an aluminum wire that is 27 m long, has diameter 0.0065 m, and has temperature 𝑇 0 = 0°C. (*) Suppose the current in the wire causes the temperature of the wire to increase 40 °C. Then what is the new resistance of the wire? 𝜌 Ω m, 𝛼 =3 .9 × 10−3/°C
- original resistance A. 0.02576 Ω D. 0.02295 Ω B. 0.02037 Ω E. 0.02196 Ω C. 0.02200 Ω /--/
- new resistance
F. 0.01951 Ω
A. 0.03177 Ω D. 0.02652 Ω
B. 0.02943 Ω E. 0.02195 Ω
C. 0.02053 Ω
F. 0.03176 Ω
KVKMF The resistivity of silver at 20 is m and its temperature coefficient is 0.0061/°𝐶. Find the resistance of a silver wire at 72°C if it is 170 m long and has diameter 0.69 mm.ˍ ˍ
A. 15.47ˍΩ D. 15.05ˍΩ B. 15.81ˍΩ E. 14.41ˍΩ C. 6.321ˍΩ F. 9.522ˍΩ /--/
(G3) GW_DC Circuits
NAQJT Three resistors in a small network have an equivalent resistance of 1000 Ω. If 𝑅 1 = 504 ˍΩ and𝑅 2 = 877.8 ˍΩ, then 𝑅 3 must be about
A. 1818 ˍΩ D. 1140 ˍΩ
B. 2227 ˍΩ E. 580.3ˍΩ
C. 1364 ˍΩ F. 1971 ˍΩ
PQBJH For the given resistances, find the equivalent resistance of the network below. 𝑅 1 = 350 ˍΩ, 𝑅 2 = 570 ˍΩ, 𝑅 3 = 350 ˍΩ, 𝑅 4 = 520 ˍΩ, and 𝑅 5 = 250 ˍΩ.
- 𝑅equivalent = A. 546.4ˍΩ D. 585.4ˍΩ B. 521.2ˍΩ E. 496.8ˍΩ C. 471.8ˍΩ F. 568.3ˍΩ /--/
R 1
R 2
R 3
1 2 3 4 5
A. 0.00007607 Cˍ D. 0.00007945 Cˍ
B. 0.00008242 Cˍ E. 0.0000691 Cˍ
C. 0.00006585 Cˍ F. 0.00007235 Cˍ
PQADH In the double-loop diagram, 𝑉 = 6 volts andˍ 𝑅 = 260 ˍΩ. Find the currents 𝐼 1 , 𝐼 2 , and 𝐼 3. Only two out of three of the currents are graded.
- 𝐼 1 A. -0.02609 Aˍ D. -0.02946 Aˍ B. -0.0284 Aˍ E. -0.03052 Aˍ C. -0.02695 Aˍ F. -0.03188 Aˍ /--/
- 𝐼 2 A. 0.01405 Aˍ D. 0.01365 Aˍ B. 0.01453 Aˍ E. 0.01288 Aˍ C. 0.01245 Aˍ F. 0.01527 Aˍ /--/
