# Chapter 14: Magnets and Electromagnetism

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1 Chapter 14: Magnets and Electromagnetism 1. Electrons flow around a circular wire loop in a horizontal plane, in a direction that is clockwise when viewed from above. This causes a magnetic field. Inside the loop, the direction of this field is A. up. B. down. C. toward the center of the loop. D. radially outward from the center of the loop. 2. A horizontally moving charge enters a magnetic field that points up. The magnetic force pushes the charge to the right of its original path. What is the sign of the charge? A. negative B. positive C. Not enough information to answer. 3. Which of these will always produce a magnetic field? A. a negative charge at rest B. a positive charge at rest C. another magnetic field D. a moving charge 4. Imagine that this classroom contains a constant magnetic field that points from the front to the back. In front of you a negative charge is slowly moving horizontally to your left. As you watch, the magnetic force on the charge A. deflects the charge into a clockwise directed vertical circle. B. deflects the charge toward you. C. has no effect on the charge. D. deflects the charge into a counterclockwise vertical circle. E. deflects the charge away from you. 5. When a current is induced by a changing magnetic field B 1, the current always produces a second magnetic field B 2 such that A. B 1 and B 2 are always the same magnitude but have opposite directions. B. B 1 and B 2 always have same direction. C. B 1 and B 2 may have the same or the opposite directions. D. B 2 strengthens B 1. E. B 1 and B 2 are at right angles from one another.

2 6. A permanent magnet is produced when A. electrons become stuck and cease to move. B. magnetic fields of large groups of individual atoms are permanently aligned. C. current is made to circulate in a clockwise direction in a loop of wire. D. electrical fields exchange electrons with the magnetic fields. 7. A positive charge is released from rest near a bar magnet. The magnetic force on the charge A. attracts it toward the N pole of the magnet. B. attracts it toward the S pole of the magnet. C. repels it away from the N pole of the magnet. D. repels it away from the S pole of the magnet. E. there is no magnetic force on the charge. 8. A bar magnet and a weak electric dipole are placed next to each other in the same plane. What happens? A. The electric dipole and the bar magnet are attracted toward each other. B. The electric dipole and the bar magnet are repelled from each other. C. The electric dipole and the bar magnet rotate in order to bring the positive charge on the electric dipole closest to the N pole of the magnet. D. The electric dipole and the bar magnet rotate in order to bring the positive charge on the electric dipole closest to the S pole of the magnet. E. Nothing happens. 9. A current flowing through a long straight wire causes a magnetic field that points A. radially outward from the wire. B. radially inward towards the wire. C. along the wire. D. along concentric circles around the wire. 10. A little magnetic compass has a needle whose tips are clearly labeled N and S. The compass is placed next to a single circular loop of wire lying flat on a wooden table. The current in the loop is clockwise. What happens? A. The N tip of the needle is attracted towards the loop. B. The S tip of the needle is attracted towards the loop. C. The needle orients itself with the N tip pointing in the direction of the current in the segment of the loop closest to the needle. D. The needle orients itself with the S tip pointing in the direction of the current in the segment of the loop closest to the needle. E. None of these.

3 11. A magnetic compass points towards the north geographic pole of the Earth because A. all magnetic poles, north or south, point that way due to the spin of the Earth. B. there is a north magnetic pole near the north geographic pole. C. there is a south magnetic pole near the north geographic pole. D. the static electricity in the atmosphere causes the alignment of the compass. 12. Two identical coils of wire are placed on a single horizontal wooden broom handle. The coils are separated by a few centimeters. We now run identical currents in the same direction through each coil. The coils experience A. no forces because the currents are identical. B. an attractive magnetic force. C. a repulsive magnetic force. D. an attractive electrostatic force because one coil is negatively charged and the other positively charged. E. a repulsive electrostatic force because both coils are identically charged. 13. Which of the following cannot induce a voltage in a loop of wire? A. Expanding or contracting the loop in a region where there is no magnetic field. B. Moving the loop near a magnet. C. Moving a magnet near the loop D. Changing the current in a nearby loop. 14. A transformer is used to either increase or decrease the voltage in an AC circuit. When the output voltage is greater than the input voltage of a transformer then A. the output energy is greater than the input energy. B. the input energy is much greater than the output energy. C. energy is still conserved. D. the output current is greater than the input current. E. the output current equals the input current. 15. A positively charged ping pong ball is sitting stationary on the floor in the center of a room. There is also a constant, uniform magnetic field in the room that points towards the ceiling. If I now start the ball rolling toward the back of the room, the resultant motion of the sphere, as observed from the ceiling, will be A. a diagonal straight line toward the left back corner of the room. B. a horizontal, clockwise circle. C. a diagonal straight line towards the right back corner of the room. D. a horizontal, counterclockwise circle. E. straight line in the original direction of motion.

4 16. A battery is causing a large current in a horizontal solenoid (helical coil of wire). A horizontal bar magnet is held at rest nearby, aligned with the axis of the solenoid, south pole closest to the solenoid. The bar magnet is being repelled by the solenoid. Which of the following statements is true of the conventional current in the solenoid? A. The current in the solenoid is flowing counterclockwise as seen from the bar magnet. B. The current in the solenoid is flowing clockwise as seen from the bar magnet. C. The current in the solenoid increases. D. The current in the solenoid is decreases. E. The direction of the current in the solenoid alternates with a constant frequency. 17. Bar A has one end painted green and the other end red, and may or may not be a magnet. A student brings the north pole of a bar magnet M close to the green end of A. He observes that the green end is repelled. He can conclude that: A. A is a magnet and the green end is a north pole. B. A is a magnet and the green end is a south pole. C. A is not a magnet. 18. The south pole of a bar magnet is moved toward an aluminum ring, along the axis of the ring. As the magnet approaches, the changing magnetic flux induces an electric current in the ring that, when seen from the bar magnet, corresponds to positive charge carriers flowing A. clockwise. B. counterclockwise. C. alternating with a fixed frequency. D. alternating with a frequency proportional to a speed of the bar magnet. 19. A horizontal straight wire carries a current from south to north. The resulting magnetic field lines are A. parallel to the wire from south to north. B. parallel to the wire from north to south. C. closed circles perpendicular to the wire directed clockwise as viewed from the south. D. closed circles perpendicular to the wire directed counterclockwise as viewed from the south. E. straight lines perpendicular to the wire. 20. Magnetic fields affect A. only electric charges at rest. B. only electric charges in motion. C. both electric charges in motion and electric charges at rest. D. neither electric charges in motion nor electric charges at rest.

5 21. The scientist credited with discovering that electric currents produce magnetic fields was A. Faraday. B. Oersted. C. Ampere. D. Coulomb. E. Tesla. 22. The magnetic pole near the Earth s north geographic pole is a A. north magnetic pole. B. south magnetic pole. C. scientists have not determined which one yet. 23. Two long bar magnets are aligned so that north poles face each other. The magnets are separated by 1 cm, and a repulsive force between the north poles is 0.10 N. When the separation is increased to 2 cm the force will be A N. B N. C N. D N. E N. 24. Two current-carrying wires are parallel to one another and separated by 1 cm. If the distance between them is increased to 2 cm the new force will be what factor times the original force? A. 4 B. 2 C. 1 D. ½ E. ¼ 25. A long horizontal wire carries a current directed from south to north. A positive charge moves toward the wire in a horizontal direction perpendicular to the wire. The direction of the force on the charge will be A. parallel to the wire and toward the south. B. parallel to the wire and toward the north. C. upward, and perpendicular to the charge s velocity. D. downward, and perpendicular to the charge s velocity. E. there is no force. 26. Imagine a magnetic field pointing into the plane of this page. An electron moves across the paper from left to right. The direction of the magnetic force on the electron will be

6 A. into the plane of the paper. B. out of the plane of the paper. C. in the plane of the paper and towards the top of the page. D. along the edge of the paper opposite the electron s velocity. E. in the plane of the paper and towards the bottom of the page. 27. The correct expression for magnetic flux through area A, where B is the magnetic field and A is an area perpendicular to the field is A. B A. B. B + A. C. B/A. D. A/B. E. 1/(B A). 28. Think of a closed rectangular loop of wire around the edge of this page. A magnetic field perpendicular to the page points upward and decreases to zero in a certain time. During this time the conventional current induced in the loop will be A. clockwise. B. counterclockwise. C. an alternating current. D. zero. 29. A transformer has 200 turns on the primary and 20 turns on the secondary. The primary is connected to a direct current source of 100 millivolts. The voltage in the secondary coil will be A. 10 millivolts. B. 20 millivolts. C millivolts. D millivolts. E. zero. 30. A transformer is to be used to step up voltage from an alternating current source from 110 V to 660 V. If the primary has 120 turns, then the number of turns in the secondary is A. 20. B C D E The south pole of a bar magnet is moved toward a short helical coil of wire (solenoid) along the axis of the coil. The coil has 100 turns and the ends of the coil are connected to form a

7 closed circuit. If the coil is replaced with a single loop of wire of the same diameter, and the magnet is moved exactly as before, the current induced in the loop is A. the same as in the coil. B. 100 times smaller. C. 100 times larger. D. zero in both cases. 32. The south pole of a bar magnet is moved toward a short helical coil of wire (solenoid) along the axis of the coil. The coil has 100 turns and the ends of the coil are connected to form a closed circuit. If the coil is replaced with a single loop of wire of the same diameter, and the magnet is moved exactly as before, the magnet experiences a force that is A. the same as before. B. repulsive and 100 times smaller. C. attractive and 100 times smaller. D. repulsive and 100 times larger. E. attractive and 100 times larger. 33. The unit used in expressing magnetic field strength is the. Answer: Tesla 34. A solenoid carrying an electric current, if free to rotate when placed in a magnetic field, will tend to orient its axis (several words). Answer: parallel to the field 35. Two parallel wires each carrying a current in the same direction will one another. Answer: attract 36. When there is a changing magnetic flux through an electric circuit, the direction of the induced current in the circuit is determined by Law. Answer: Lenz s 37. The north pole of a bar magnet is moved toward a single closed loop of wire along the axis of the loop. The induced current in the loop produces an effective pole toward the bar magnet. Answer: north 38. A bar magnet is held near a single closed loop of wire. The magnet is aligned with the loop axis, and the north pole is facing the loop. If the magnet is moved away, the current induced in the loop will be in a direction as viewed from the side the magnet is on. Answer: clockwise

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