Multiple Choice: Select the best answer and mark it clearly. (1 mark each) 1 ) An initially uncharged ebonite (hard rubber) rod is rubbed with an initially uncharged piece of cat's fur. As a result, the fur becomes positively charged and the ebonite becomes equally charged negative. This best illustrates A. the law of conservation of charge B. the law of conservation of mass C. Coulomb's law D. Ohm's law 2) Which of the following is a definition of conventional direct current? A. A movement of negative charge in one direction only B. A movement of positive charge in one direction only C. A shift of negative charge that reaches a peak in the forward direction before reversing and reaching a peak in the reverse direction D. A shift of positive charge that reaches a peak in the forward direction before reversing and reaching a peak in the reverse direction Use the following information to answer the next question. A popular game of young children is to shuffle across a carpet with stocking feet and then touch a friend. The spark that can be generated is caused by a charge buildup from the friction of the socks on the carpet. 3) Two friends, Steve and John, shuffled on a carpet and obtained approximately the same negative charge. They then stood shoulder to shoulder without touching. A third friend, Calvin, who was not charged, touched John on the shoulder farthest from Steve. What is the nature of the final charges on the three boys? A. Steve, John, and Calvin are all negatively charged. B. John and Calvin are uncharged, and Steve is negatively charged. C. Steve and Calvin are negatively charged, and John is positively charged. D. Steve is negatively charged, and John and Calvin are positively charged.Use the following information to answer the next question. Two small metal spheres are fixed to insulated stands and given static charges of -4.00 x 10% C and +2.00 x 10 % C, respectively. The spheres are then placed 0.500 m apart. Point P is halfway between the charged spheres. 4) At point P, the magnitude of the electric field caused by the two charged spheres is A.) 8.63 x 105 N/C B. 2.88 x 105 N/C C. 2.16 x 105 N/C D. 7.19 x 104 N/C 1 5 ) A negatively charged plastic rod is brought near a small neutral piece of paper. A force of attraction results because the A. paper loses protons B. paper gains electrons C. protons rearrange themselves D. electrons rearrange themselves 6) Two very small spheres have charges of +4.0 JC and -6.0 JC are place 6.0 cm away from each other. The magnitude of the electric force on each sphere is A. 59.9 N B. 75.5 N C. 8.01 N D. 8.0 x 10' N 7) Two identical objects, one neutral and the other with a charge of +6.0 uC, are brought into contact and then separated to distance of 1.25 m. Calculate the magnitude of the electrostatic force between the two charged objects. A. 0.041 N B. 0.62 N C. 0.052 N D. 5.8 x 10' N8) Identify the graph that best describes the relationship between electric force (Fe) and charge (q) between two charged objects. A. B. Fe BA q q C. D. Fe Fe q q Use the information below to answer the next question. Three point charges, A, B, and C, are arranged in a line as shown. Object A is positively charged. B FAB FCB 9) The charge on B and C must be B C A. negative negative B. positive positive C. negative positive positive negative10) Two positive point charges are placed as shown in the diagram. At point P the magnitude of the electric field due to charge A is 8.0 x 10 N/C. The magnitude of the electric field due to charge B at point P is 3.0 x 10 N/C. Determine the net electric field at point P. - 2 A. 8.5 x 106 N/C, 69 E of N +B . B. 7.2 x 106 N/C, 560 N of E C. 6.0 x 10 N/C, 560 N of E D. 5.0 x 106 N/C, 56 E of N 11) An electric field causes a small negatively charged particle to move to the east. The direction of the electric field is A. north B. south C. east D. west Use the following information to answer the next question. An alpha particle and an electron traveling at the same speed enter perpendicularly into a uniform magnetic field. 12) Which of the following statements concerning the forces on the particles is true? A. the force on the alpha particle is smaller because it carries the higher charge. B. the force on the alpha particle is greater because its mass is greater. C. the force on the electron is smaller because it carries the smaller charge. D. The force on the particles is equal. 13) A proton moves across a field of magnetic induction of 0.36 T. It follows a circular path of radius of 0.20 m. The proton's speed is A. 6.9 x 106 m/s B. 9.6 x 102 m/s C. 6.9 x 105 m/s D. 6.9 x 10' m/s; uestions. Use this additional information to answer the next 2 q Photocopier Photocopier drum 5.00 mm Assume that the beads of The charge on each bead of the drum with the ima N D 14) When the toner and the drum are separated by 5.00 mm, the force of attraction between the letter and the toner bead, expressed in scientific notation, is b % 10" N. The value of bis - (Record your three-digit answer in the numerical-response section on the answer sheet.) toner (dry ink) and letters on the drum act as point charges. of toner is -4.60 x 10" C and the average charge on the part ge of the letter copied is +2.20 x 10" C Use your answer Jfrom Question #12 to answer Question #13. e I5) Each coated bead in the photocopier has an average mass of 1.45 x 10-15 kg. The acceleration of a bead toward the drum, expressed in scientific notation, is b x 10" m/s?, Ignoring the presence of gravity, the value of b is Use the following information to answer the next question. Magnetic Field of a Bar Magnet N S 1 18) The direction of the magnetic field at point X is toward the A. bottom of the page B. right of the page C. left of the page D. top of the page Use the information below to answer the next question. The diagram on the right shows a compass needle pointing towards an electromagnet. (The dark end of the compass needle is its north end.) A battery is inserted between C and D to cause the compass needle to point as indicated. D 19) Identify the polarity of the electromagnet and the electric polarity of the battery that powers the electromagnet. A is B is C is and D is A. north, south, positive, negative B. north, south, negative, positive C. south, north, positive, negative D. south, north, negative, positive16) Identify the diagram that best represents magnetic field lines around a bar magnet. Z Z Z Use the following information to answer the next question. Alpha Particles in Magnetic Fields Z A horizontal beam of alpha particles is projected perpendicularly between a pair of magnetic poles. 17) The ions will be deflected A. upward B. downward C. toward the north pole D. toward the south pole20) Electrons move through a field of magnetic induction of 5.0 x 10-2 T. An electric field of 400 N/C prevents the electrons from being deflected. The electron's speed is A. 6.9 x 102 m/s B. 5.0 x 103 m/s C. 8.0 x 103 m/s D. 6.9 x 103 m/s 21) Identify the fields that are capable of exerting a force on a beam of electrons. A. Electric fields only B. Magnetic fields only C. Magnetic and electric fields only D. Electric, gravitational, and magnetic fields Use the following information to answer the next question. An electron approaches an electric field and a magnetic field as shown in the two diagrams below. Electric field Magnetic field 2) Which best describes the direction the electron travels through each field? Electric Field Magnetic Field down into the page down into page down out of pagefollowing information to answer the next question. A Current in an External Magnetic Field S word noise N 26) The direction of the magnetic force exerted on the current-carrying wire is A. toward the top of the page B. toward the bottom of the page C. into the plane of the page D. out of the plane of the page' w : : it of tesla. \\_l_r,_, 23) Identify the units below that are not equivalent 10 the unit A. k[i."s?'A B. Nes/Ce'm C. N/mes*C D. N/m*A Use the diagram below to answer the next question- Magnet @ 24) The direction of electron flow through the galvanometer is . from left to right up . from right to left . down DO wp Use the following information to answer the next two questions. s=bvl A wire of length / (with a speed v) passes perpendicularly through an external magnetic field b. the wire is 10.7 m/s and the @ 25) When the magnetic field strength is 0.235 t, the speed of length of the wire is 27.8 cm. the numerical value of s in si base units is A. 0.699 Bi2.51 C 11699 D. 251