# Physics 55 Final Exam Fall 2012 Dr. Alward Page 1

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1 Physics 55 Final Exam Fall 2012 Dr. Alward Page 1 1. The specific heat of lead is cal/g C. 300 g of lead shot at 100 C is mixed with 100 g of water at 70 C in an insulated container. The final temperature of the mixture is: A) 100 C B) 85.5 C C) 79.5 C D) 72.5 C 2. The rate of heat flow through a slab is R If the slab thickness is doubled, its cross-sectional area is halved, and the temperature difference across it is doubled, then the rate of heat flow becomes: A) 2R B) R/2 C) R D) R/8 3. A particle with a charge of C and a mass of 20 g moves uniformly with a speed of 7 m/s in a circular orbit around a stationary particle with a charge of C. The radius of the orbit is: A) 0 B) 0.23 m C) 0.62 m D) 1.6 m 4. A particle with charge 2 C charge is placed at the origin, an identical particle, with the same charge, is placed 2 m from the origin on the x axis, and a third identical particle, with the same charge, is placed 2 m from the origin on the y axis. The magnitude of the force on the particle at the origin is: A) N B) N C) N D) N Page 1

2 Physics 55 Final Exam Fall 2012 Dr. Alward Page 2 5. Two small charged objects repel each other with a force F when separated by a distance d. If the charge on each object is reduced to one-fourth of its original value and the distance between them is reduced to d/2 the force becomes: A) F/16 B) F/8 C) F/4 D) F/2 6. The diagrams below depict four different charge distributions. The charged particles are all the same distance from the origin. The electric field at the origin: A) is greatest for situation 1 B) is greatest for situation 3 C) is zero for situation 4 (Either A or C is correct.) D) is downward for situation 1 E) is downward for situation 3 7. An isolated point charged point particle produces an electric field with magnitude E at a point 2 m away from the charge. A point at which the field magnitude is E/4 is: A) 1 m away from the charge B) 0.5 m away from the charge C) 2 m away from the charge D) 4 m away from the charge 8. Positive charge Q is placed on a conducting spherical shell with inner radius R 1 and outer radius R 2. A particle with charge q is placed at the center of the cavity. The magnitude of the electric field at a point in the cavity, a distance r from the center, is: A) 2 kq/r 1 B) kq/(r 2 1 -r 2 ) C) kq/r 2 D) k(q+q)/r 2 E) k(q+q)/(r 2 1 -r 2) Page 2

3 Physics 55 Final Exam Fall 2012 Dr. Alward Page 3 9. Positive charge Q is placed on a conducting spherical shell with inner radius R 1 and outer radius R 2. A point charge q is placed at the center of the cavity. The magnitude of the electric field at a point r from the center, where R 1 < r < R 2, is: A) 2 Q / 4 R 0 1 B) 2 2 Q 0 R1 r / 4 ( ) C) q/4 0 r 2 D) (q + Q)/4 0 r 2 E) Charge is distributed uniformly along a long straight wire. The electric field 2 cm from the wire is 20 N/C. The electric field 4 cm from the wire is: A) 120 N/C B) 80 N/C C) 40 N/C D) 10 N/C 11. A 3.5-cm radius hemisphere contains a total charge of C. The flux through the rounded portion of the surface is N m 2 /C. The flux through the flat base is: A) 0 B) N m 2 /C C) N m 2 /C D) N m 2 /C E) N m 2 /C 12. A point particle with charge q is placed inside a cube at its center. The electric flux through any one side of the cube: A) is zero B) is q/ 0 C) is q/4 0 D) is q/6 0 E) cannot be computed using Gauss' law Page 3

4 Physics 55 Final Exam Fall 2012 Dr. Alward Page Positive charge is spread along a line of length L=1 meter on the x-axis. The left end of the line of charge is at the origin, and the linear charge density,, varies according to the equation, (x) = 2 x 10-9 x, where x is measured in meters, and coulombs per meter. What is the electric potential (in volts) at a point located a distance d = 2 meters from the right end of the line of charge? (Use k = 9 x 10 9 N-m 2 /C 2.) A) 2.86 B) 3.90 C) 4.12 D) A particle with a charge of C charge is fixed at the origin. A particle with a charge of C charge is moved from x = 3.5 cm on the x axis to y = 3.5 cm on the y axis. The change in the potential energy of the two-charge system is: A) J B) J C) J D) J E) A battery is used to charge a parallel-plate capacitor, after which it is disconnected. Then the plates are pulled apart to twice their original separation. This process will double the: A) capacitance B) surface charge density on each plate C) stored energy D) electric field between the two places E) charge on each plate 16. A certain capacitor has a capacitance of 5.0 F. After it is charged to 5 C and isolated, the plates are brought closer together so its capacitance becomes 10 F. The work done by the agent is about: A) 0 B) J C) J D) J Page 4

5 Physics 55 Final Exam Fall 2012 Dr. Alward Page The diagram shows six 6- F capacitors. The capacitance between points a and b is: A) 3 F B) 4 F C) 6 F D) 9 F 18. Each of the three 25- F capacitors shown is initially uncharged. How many coulombs of charge pass through the ammeter A after the switch S is closed? A) 0.10 B) 0.20 C) 10 D) 0.05 E) none of these 19. An ordinary light bulb is marked "60 watt, 120 volt". Its resistance is: A) 60 B) 120 C) 180 D) 240 Page 5

6 Physics 55 Final Exam Fall 2012 Dr. Alward Page The current in the 5.0- resistor in the circuit shown is: A) 0.42 A B) 0.67 A C) 1.5 A D) 2.4 A 21. A battery is connected across a parallel combination of two identical resistors. If the potential difference across the terminals is V and the current in the battery is I, then: A) the potential difference across each resistor is V and the current in each resistor is I. B) the potential difference across each resistor is V/2 and the current in each resistor is I/2. C) the potential difference across each resistor is V and the current in each resistor is I/2. D) the potential difference across each resistor is V/2 and the current in each resistor is I. E) none of the above are true 22. Four 20- resistors are connected in parallel and the combination is connected to a 20-V emf device. The current in the device is: A) 0.25 A B) 1.0 A C) 4.0 A D) 5.0 A 23. Two identical batteries, each with an emf of 18 V and an internal resistance of 1, are wired in parallel by connecting their positive terminals together and connecting their negative terminals together. The combination is then wired across a 4- resistor. The current in the 4- resistor is: A) 1.0 A B) 2.0 A C) 4.0 A D) 3.6 A Page 6

7 Physics 55 Final Exam Fall 2012 Dr. Alward Page A 3- and a 1.5- resistor are wired in parallel and the combination is wired in series to a 4- resistor and a 10-V emf device. The current in the 3- resistor is: A) 0.33 A B) 0.67 A C) 2.0 A D) 3.3 A 25. A charged capacitor is being discharged through a resistor. At the end of one time constant the charge has been reduced by (1 1/e) = 63% of its initial value. At the end of two time constants the charge has been reduced by what percent of its initial value? A) 82% B) 86% C) 100% D) between 90% and 100% 26. A certain capacitor, in series with a resistor, is being charged. At the end of 10 ms its charge is half the final value. The time constant for the process is about: A) 0.43 ms B) 2.32 ms C) 6.93 ms D) ms 27. A current of 20 amperes is being drawn from a battery whose emf is 24 volts. The internal resistance of the battery is 0.3 ohms. By how many volts is the battery "loaded down"? A) 2 B) 3 C) 5 D) 4 Page 7

8 Physics 55 Final Exam Fall 2012 Dr. Alward Page A loop of wire carrying a current of 2.0 A is in the shape of a right triangle with two equal sides, each 15 cm long. A 0.7 T uniform magnetic field is in the plane of the triangle and is perpendicular to the hypotenuse. The resultant magnetic force on the two sides has a magnitude of: A) 0 B) 0.21 N C) 0.30 N D) 0.41 N 29. The diagram shows a straight wire carrying a flow of electrons into the page. The wire is between the poles of a permanent magnet. The direction of the magnetic force exerted on the wire is: A) B) C) D) E) into the page 30. Two long straight wires pierce the plane of the paper at vertices of an equilateral triangle as shown below. They each carry 2 A, out of the paper. The magnetic field at the third vertex (P) has magnitude (in T): A) B) C) D) Page 8

9 Physics 55 Final Exam Fall 2012 Dr. Alward Page A long, cylindrical straight wire carries a current density J that varies with respect to the distance r from the axis according to the equation, J = 3r 2, where J is in A/m 2, and r is in meters Use Ampere's Law to find the magnetic field inside the wire at a distance d from the axis. A) 3 0 d 3 /4 B) 4 0 d C) 0 /d 2 D) A 10 ohm resistor is connected to a 4 volt battery, as shown in the figure. the arrangement of circuit elements and the wires forms a square, each side of which is 12 cm. The circuit is in a uniform magnetic field that is into the page. The current in the circuit is 0.20 A. At what approximate rate (in T/s) is the magnitude of the magnetic field changing? A) zero B) 140 C) 160 D) A 6.0-mH inductor and a 3.0- resistor are wired in series to a 12-V ideal battery. A switch in the circuit is closed at time 0, at which time the current is zero. 2.0 ms later the energy stored in the inductor is: A) 0 B) J C) J D) J Page 9

10 Physics 55 Final Exam Fall 2012 Dr. Alward Page How many calories are required to change one gram of 0 C ice to 100 C steam? The latent heat of fusion is 80 cal/g and the latent heat of vaporization is 540 cal/g. The specific heat of water is 1.00 cal/g K. A) 100 B) 540 C) 620 D) 720 Page 10

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