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CU-Boulder PHYS 1120 - Final Exam Review

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1 of 15 Concept Tests -- Final Review CTF-1. Calculator question: 105 = ? A) 1E5 B) 10E5 C) something else. CTF-2. A cube is made larger and larger... As the cube grows, the ratio areavolume.. A) increases B) decreases C) remains constant. Phys1120 Dubson ©University of Colorado at Boulder2 of 15 CTF-3. A box with mass M and charge +Q is pushed along a rough surface at constant velocity by a uniform horizontal electric field of magnitude E. The coefficient of kinetic friction between the box and the floor is µ. What is the net force on the box? A) QE B) µ Μ g C) QE – Mg D) QE – Mg + FN – µ Mg . E) None of these M, Q v = constant E µ Phys1120 Dubson ©University of Colorado at Boulder3 of 15 CTF-4. A row of positive charges is stationary on the ground. A person with a gauss-meter (which measures the magnetic field) is running to the right along the row of charges, at the same height as the charges and in front of them (in the diagram below). Does the person measure a non-zero B-field? A) Yes B) No v What is the direction of the B-field which the moving observer measures? A) Up↑ B) Down↓ C) Forward direction → D) backward direction ← E) no direction, B-field zero Phys1120 Dubson ©University of Colorado at Boulder4 of 15 CTF-5. A charge q is located at the center of an gaussian cubical box as shown. A student is asked: What is the electric flux ΦE though the top face of the cube? Is the answer hard to calculate or easy to calculate? A: Easy B: Hard. q CTF-6. A capacitor with capacitance C is attached to a battery with voltage V. What is the flux GGEda⋅z through the cubical volume shown? (The end faces of the cube are within the metal plates of the capacitor. V C A) CVoε B) 2CVoε C) zero D) None of these. Phys1120 Dubson ©University of Colorado at Boulder5 of 15 CTF-7. Points A and B are distances r and 3r respectively from a point charge q. What is the voltage difference between points A and B? q r 2r A B A)23kqr B) 3kqr C) 89kqr D) 34kqr E) None CTF-8. Consider a point in empty space near several charges, which might be positive, negative, or both. Consider the following statements. I. The E-field can be zero while the voltage is non-zero. II. The voltage can be zero while the E-field is non-zero. Which of these statements can be true? A) both can be true B) neither can be true C) only I can be true D) only II can by true Phys1120 Dubson ©University of Colorado at Boulder6 of 15 CTF-9. A capacitor has a voltage V across its plates. An electron, initially at rest, is released from at a point very close to the negative plate of a capacitor and it accelerates toward the positive plate. The electron has charge –e and mass m. There is no gravity in this problem. What is the final kinetic energy of the electron just before it collides with the positive plate? VA) meV⋅⋅ B) 2eV C) (1/2)mV2 D) eV E) None of these Phys1120 Dubson ©University of Colorado at Boulder7 of 15 CTF-10. A resistor with resistance R is plugged into a 120VAC wall socket. The graph below is either resistance R, voltage V across, current I thru, or power P dissipated in the resistor vs. time. time ? What could the graph be? A) V only B) I only C) V or I only D) V, I, or P E) Some other combination Phys1120 Dubson ©University of Colorado at Boulder8 of 15 CTF-11. Consider the circuit shown, with the switch initially open. When the switch is closed, the current I1 through resistor R1 VR1R2I1IbatA) increases, B) decreases, C) stays the same. When the switch is closed, the current from the battery Ibat A) increases, B) decreases, C) stays the same. Phys1120 Dubson ©University of Colorado at Boulder9 of 15 CTF-12. When a resistor is plugged into a standard AC outlet, the fuse blows and all the lights go out. If we want to repeat this dangerous experiment, and not have the fuse blow, we need a resistor that is A) larger B) smaller C) Same R, but larger power rating CTF-13. A charge q is released from rest at point in empty space were there may be E- and/or B-fields. There are no forces on the charge except for the forces due to the E and/or B-fields (no gravity, etc.). The charge is observed for a short while and is seen to move along a curved path. q Consider the following possibilities I. There is only an E-field present and no B-field. II. There is only a B-field present and no E-field. III. There is both an E-field and a B-field present. Which possibilities could account for the observed motion? A) all three B) I and III only C) II and III D) III only Phys1120 Dubson ©University of Colorado at Boulder10 of 15 CTF-14. At time to, a particle with charge q has instantaneous velocity ovGas shown and is moving in a uniform magnetic field BJG. A) True or B) False ? B V q x y As time increases, the x-component of the velocity vx remains constant. A) True or B) False: The KE of the particle remains constant as time increases. CTF-15. A long solenoid with many turns per length has a uniform magnetic field B within its interior. Consider the imaginary rectangular path of length c and width a with one edge entirely within the solenoid as shown. What is GGBdl⋅z? c a B A) Bc B) 2B(c + a) C) 2Bc D) None of these The solenoid has n turns per length and carries a current I. What is GGBdl⋅z? A) B) µ C) µonIoncIµona cI()+ D) None of these. Phys1120 Dubson ©University of Colorado at Boulder11 of 15 CTF-16. A horizontal loop of wire is in a vertical magnetic field. (caused by an external magnet). The magnetic field varies smoothly from pointing upward to pointing downward, as shown. (The B-field gradually gets smaller, goes to zero, then grows in the other direction.) At the moment when the external magnetic field in the loop is zero, is there an induced current in the loop? A) Yes B) No At the moment when the external B-field in the loop is zero, what is the direction of the induced current? A) Clockwise (as seen from above) B) Counterclockwise C) No direction because induced current is reversing Phys1120 Dubson ©University of Colorado at Boulder12 of 15 CTF-17. A single circular loop of wire of radius R surrounds a long solenoid of radius r, turns per length n, carrying a current I. The diagram shows the end-on view of the


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