Physics1410_Chapter_14_practice_questions (1)

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Chapter 014 Magnets and Electromagnetism 1. A horizontally moving positive sodium ion enters a magnetic field that points up. The magnetic force pushes the charge out of its original path. When viewed from the perspective of the charge, what direction will the magnetic force point? A. Left, into the page. B. Right, out of the page. C. Not enough information to answer. 2. 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 3. 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.

4. 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. 5. A current flowing through a long, straight wire causes a magnetic field that points A. radially outward from the wire. B. radially inward toward the wire. C. along the wire. D . along concentric circles around the wire. 6. 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. 7. 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. 8. 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.

9. 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. 10. The scientist credited with discovering that electric currents produce magnetic fields was A. Faraday. B. Oersted. C. Ampere. D. Coulomb. E. Tesla. 11. The magnetic pole near the Earth's north geographic pole actually has to be A. an S pole, because it attracts the N pole of your compass needle. B. an N pole because it repels the S pole of your compass needle. C. either an N or an S pole, but scientists have not determined which one yet. 12. 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 0.08 N. When the separation is in- creased to 2 cm the force will be A. 0.10 N. B. 0.050 N. C. 0.025 N. D. 0.020 N. E. 0.40 N. 13. 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

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14. A long horizontal wire carries a current directed from north to south. 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. 15. 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). 16. 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. 1000 millivolts. D. 4000 millivolts. E. zero. 17. 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. 660. C. 720. D. 4320. E. 6600. 18. 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 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.

19. If a current of negative charge flows in a circle in the direction of one's fingers of the right hand, the resulting magnetic field would be in the direction A. of the thumb of the right hand B. opposite to the thumb of the right hand C. of the right index finger D. of due north 20. The unit used in expressing magnetic field strength is the ___tesla_______. 21. Two parallel wires each carrying a current in opposite directions will ________repel__________ one another. 22. When there is a changing magnetic flux through an electric circuit, the direction of the induced current in the circuit is determined by ______Lenz’s_______ Law. 23. Faraday's Law states that a voltage is induced in a circuit when there is a changing ____magnetic flux___________ passing though the circuit. 24. A solenoid carrying an electric current, if free to rotate when placed in a magnetic field, will tend to orient its axis ______________parallel to the field___________________ (several words).

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