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(G 1 ) Electric Potential and Capacitance PHY 202 Student Code: nature
Electric Potential
NETVK A uniform electric field is oriented toward the right and has magnitude 58ˍN/C. () In which direction will the electron move once it is released at rest? (*) Find the speed of the electron after it has moved 0.25ˍm. (Note: The mass of an electron is 9. 11 × 10 −^31 kg and its charge is − 1. 6 × 10 −^19 C.)
- direction A. left B. right /--/
- speed A. 3415000ˍm/s D. 3627000ˍm/s B. 3248000ˍm/s E. 4273000ˍm/s C. 2257000ˍm/s F. 1847000ˍm/s /--/ JSJJP Suppose 𝑞 1 = 4.7ˍμC, 𝑞 2 = - 7.9ˍμC, 𝑑 1 = 0.39ˍm, 𝑑 2 = 0.59ˍm, and 𝐿 = 0.82ˍm. Then find the electric potential at the X.
A. - 27920ˍvolts D. - 28750ˍvolts B. - 23800ˍvolts E. - 27080ˍvolts C. - 25990ˍvolts F. - 25190ˍvolts /--/
IXMJL If a 4.0 μC charge is located at the origin and a - 6.4 μC charge is located at 0.80 m on the x-axis, then find the electric potential at (0.14 m, 0.56 m).
A. 1610 Volts 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 17.8ˍμF. 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 28.9ˍVolts. Find the amount of charge 𝑄.
- 𝑄 = A. 348.1ˍμC D. 647.8ˍμC B. 287ˍμC E. 514.4ˍμC C. 882.9ˍμC F. 731.4ˍμC /--/ IXMJJ What is the capacitance of a parallel-plate capacitor with area 2.8ˍdm² if the separation between the plates is 0.4ˍm? Then suppose a dielectric with constant 2.2 is placed between the plates of the capacitor. What is the resulting capacitance? Use 𝜖 0 = 8.85E-12ˍC²/N·m².
- Original Capacitance A. 0.7048ˍpF D. 0.622ˍpF B. 0.6195ˍpF E. 1.026ˍpF C. 0.4621ˍpF F. 1.018ˍpF /--/
POXYX Use the capacitances given below to find the equivalent capacitance. 𝐶 1 = 170ˍμF, 𝐶 2 = 100ˍμF, 𝐶 3 = 160ˍμF, 𝐶 4 =100ˍμF
A. 87.05ˍμF D. 79.88ˍμF B. 82.83ˍμF E. 77.07ˍμF C. 90.35ˍμF F. 74.53ˍμF /--/ 1
(G 2 ) Current and Resistance PHY 2 02 Student Code: nature IYFNI A beam of protons at an accelerator creates a current of 120 μA. If the beam is focused on a target, how many protons strike the target in 30.0 s?
A. 1.902E+16 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 3.2ˍmm and resistivity 1. 5 × 10 −^6 Ω ⋅ m is to be used in winding a coil. If the coil will have a resistance of 31ˍΩ, then find the length of wire you must use to wind the coil.
A. 172.6ˍm D. 188.2ˍm B. 147.3ˍm E. 178.7ˍm C. 166.2ˍm F. 156.9ˍm /--/ PPRFM At room temperature, about 0°C, aluminum has resistivity 𝜌 0 =. 8 × 10 −^8 Ω ⋅ m. Find the resistance of an aluminum wire at this temperature if the wire is 60ˍm long and has diameter 0.11ˍmm.
A. 186.1ˍΩ D. 193.5ˍΩ B. 170.7ˍΩ E. 159ˍΩ C. 178ˍΩ F. 164.9ˍΩ /--/
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 /--/
(G 3 ) GW_DC Circuits PHY 20 2 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 Ω load?
A. 9.861 V D. 10.09 V B. 11.72 V E. 9.912 V C. 13.87 V F. 10 .21 V /--/ IZGHM The diagrammed network can be replaced with a single resistor with what resistance?
A. 12.91 Ω D. 15.31 Ω B. 19.05 Ω E. 18.97 Ω C. 18.74 Ω F. 12.20 Ω /--/
KORMT Suppose 𝑅 = 140ˍΩ and 𝐶 = 50ˍμF in a (charging) RC-series circuit with a 10ˍV power source. What is the maximum charge on the capacitor? What is the charge on the capacitor after 0.0015ˍs?, What is the charge after 1.4 time constants?
- max charge A. 0.0005651ˍC D. 0.000329ˍC B. 0.0006766ˍC E. 0.0005ˍC C. 0.0008119ˍC F. 0.0005361ˍC /--/
- charge after 0.0015ˍs A. 0.0001923ˍC D. 0.00005789ˍC B. 0.0001424ˍC E. 0.0001391ˍC C. 0.00007071ˍC F. 0.00009644ˍC /--/
- charge after 1.4 time constants A. 0.0005556ˍC D. 0.0004785ˍC B. 0.0004812ˍC E. 0.0003767ˍC C. 0.0007434ˍC F. 0.0006145ˍC /--/ IZGHL Suppose R = 290ˍΩ and C = 110ˍμF in a (charging) RC-series circuit with a 6.6ˍV power source. What is the maximum charge on the capacitor? After 3.1 time constants, the capacitor will reach what percent of its maximum charge?
- max charge A. 0.0006723ˍC D. 0.000726ˍC B. 0.001006ˍC E. 0.0006513ˍC C. 0.0005074ˍC F. 0.001437ˍC /--/
- percent A. 95.57ˍ% D. 118.2ˍ% B. 90.64ˍ% E. 95.5ˍ% C. 51.64ˍ% F. 82.69ˍ% /--/
(G) Test_Electromagnetism 2 PHY 20 2 Student Code: nature
(G1) GW_Electric Potential and Capacitance
POXXU Suppose 𝑞 1 = 4.2ˍμC, 𝑞 2 = - 7.5ˍμC, 𝑑 1 = 0.33ˍm, 𝑑 2 = 0.6ˍm, and 𝐿 = 0.88ˍm. Then find the electric potential at the X.
A. - 27660ˍvolts D. - 23160ˍvolts B. - 26330ˍvolts E. - 25280ˍvolts C. - 23930ˍvolts F. - 22400ˍvolts /--/ 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 0 =. 8 × 10 −^8 Ω ⋅ m, 𝛼 =. 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 F. 0.01951 Ω /--/
- new resistance 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 0 °C is 1. 59 × 10 −^8 Ω⋅m and its temperature coefficient is 0. 0061 /°𝐶. Find the resistance of a silver wire at 72°C if it is 170ˍm long and has diameter 0.69ˍmm.
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 = 504ˍΩ and 𝑅 2 = 877.8ˍΩ, then 𝑅 3 must be about
A. 1818ˍΩ D. 1140ˍΩ B. 2227ˍΩ E. 580.3ˍΩ C. 1364ˍΩ F. 1971ˍΩ /--/ PQBJH For the given resistances, find the equivalent resistance of the network below. 𝑅 1 = 350ˍΩ, 𝑅 2 = 570ˍΩ, 𝑅 3 = 350ˍΩ, 𝑅 4 = 520ˍΩ, and 𝑅 5 = 250ˍΩ.
- 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
PQADH In the double-loop diagram, 𝑉 = 6ˍvolts and 𝑅 = 260ˍΩ. Find the currents 𝐼 1 , 𝐼 2 , and 𝐼 3. Only two out of three of the currents are graded.
- 𝐼 1 A. - 0.02609ˍA D. - 0.02946ˍA B. - 0.0284ˍA E. - 0.03052ˍA C. - 0.02695ˍA F. - 0.03188ˍA /--/
- 𝐼 2 A. 0.01405ˍA D. 0.01365ˍA B. 0.01453ˍA E. 0.01288ˍA C. 0.01245ˍA F. 0.01527ˍA /--/
