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1 1. The diagram below represents lines of magnetic flux within a region of space. 5. The diagram below shows an electromagnet made from a nail, a coil of insulated wire, and a battery. The magnetic field strength is greatest at point A) A B) B C) C D) D 2. The diagram below shows the magnetic field lines between two magnetic poles, A and B. The south pole of the electromagnet is located closest to point A) A B) B C) C D) D 6. Base your answer to the following question on The diagram below shows electron e about to enter the region between the poles of two magnets. Which statement describes the polarity of magnetic poles A and B? A) Both A and B are south poles. B) A is a north pole and B is a south pole. C) A is a south pole and B is a north pole. D) Both A and B are north poles. 3. Which diagram best illustrates the magnetic field that exists around a current-carrying wire? A) B) C) D) 4. Which device can be used to convert mechanical energy into electrical energy? A) electroscope B) electromagnet C) electric motor D) electric generator Upon entering the region between the poles, the moving electron will experience a magnetic force directed A) into the page B) toward the north pole C) out of the page D) toward the south pole 7. Which expression is a unit of potential difference equivalent to a volt? A) B) C) D)

2 8. Base your answer to the following question on In the diagram below, a wire carrying an conventional current into the page, as denoted by X, is placed in a magnetic field. Base your answers to questions 10 and 11 on the information and diagram below. Two coils of wire are wound around the same permeable core. Coil I has 200. turns and coil II has turns. Coil I is supplied with 30.0 amperes of alternating current at 90.0 volts. The magnetic field exerts a force on the wire toward point A) C B) D C) A D) B 9. Base your answer to the following question on The diagram below shows an end view of a straight conducting wire, W, moving with constant speed in uniform magnetic field B. As the conductor moves through position P, the conventional current induced in the wire is directed A) into the page B) toward the top of the page C) toward the bottom of the page D) out of the page 10. What does the diagram above represent? A) a transistor B) a step-down transformer C) a step-up transformer D) an ammeter 11. What potential difference is induced in coil II? A) 6.00 V B) 2700 V C) 90.0 V D) 1350 V

3 13. A particle executes uniform circular motion with speed v due to the influence of a magnetic force within a uniform magnetic field B. If the particle's charge is q, and the radius of the path of the particle is r, find an expression for the mass of the particle. 14. A) v 2 rqb B) rqb v 2 C) rqb v D) v rqb E) rqvb In the figure above, what is the direction of the particle's velocity? A) Out of the plane of the page B) Into the page C) Upward, in the plane of the page D) To the left E) To the right 15. Base your answer to the following question on the diagram below which shows two large parallel conducting plates connected to a battery of emf. A magnetic field is applied in the region in between the plates such that a particle with a positive charge traveling to the right in this region would feel no net force. What direction should this magnetic field point? A) towards the left B) out of the page C) towards the top of the page D) towards the right E) into the page 16. Two long, straight, parallel wires are placed a distance d apart. A current of I runs through each, in opposite directions. The force per unit length on each wire is 17. A) repulsive, magnitude (µ0/2 )I 2 /d B) attractive, magnitude (µ0/2 )I/d C) attractive, magnitude (µ0/2 )I 2 /d 2 D) repulsive, magnitude (µ0/2 )I 2 /d E) repulsive, magnitude (µ0/2 )I/d There is a clockwise current in a circular loop of wire in an external magnetic field directed out of the page as shown in the diagram above. The effect of the magnetic field is to make the loop A) rotate in the plane of the page. B) move into the page. C) rotate perpendicularly to the page. D) expand. E) contract. 18. If the resistance of a long straight wire is doubled and the voltage remains constant, the magnetic field produced by the wire A) increased by a factor of 2 B) the magnetic field is not influenced by a change in resistance C) decreases by a factor of 4 D) increase by a factor of 4 E) decreases by a factor of A square loop of copper wire enclosing an area of 0.10 m is initially placed perpendicular to a magnetic field of 2.0 T. The loop is rotates through 90 degrees, remaining perpendicular to the field. The turn takes 0.5 s. The average emf induced in the loop during the turn is A) 0.4 V B) 40 V C) 0 V D) 2.5 V E) 10 V

4 Base your answer to the following question on A rectangular wire loop is at rest in a magnetic field of magnitude 4 T, directed out of the page as shown above. The loop is 10 cm by 4 cm, and the plane of the loop is perpendicular to the field. The total magnetic flux through the loop is A) T m 2 B) 0 T m 2 C) T m 2 D) T m 2 E) T m Base your answer to the following question on The above diagram shows a metal loop of wire in a uniform magnetic field pointing into the page. If the magnetic field B uniformly decreases, the induced electric current within the loop is A) clockwise and constant. B) clockwise and increasing. C) counterclockwise and increasing. D) clockwise and decreasing. E) counterclockwise and decreasing. 23. Base your answer to the following question on In the diagram, a loop of wire with radius l rotates in a plane perpendicular to the uniform magnetic field B with constant velocity v. The emf induced in the loop is A) 2 Blv clockwise B) Bvl 2 clockwise C) 0 D) Bvl 2 counterclockwise E) 2 Blv counterclockwise A permanent bar magnet is pulled through a wire loop with a constant velocity as shown above. Which of the following best describes the current in the wire loop? (looking down on the loop from above) A) First counterclockwise, then changes to clockwise. B) First clockwise, then changes to counterclockwise. C) Always counterclockwise. D) Always clockwise. E) No current is induced in the loop.

5 1. The diagram below represents lines of magnetic flux within a region of space. 5. The diagram below shows an electromagnet made from a nail, a coil of insulated wire, and a battery. The magnetic field strength is greatest at point A) A B) B C) C D) D 2. The diagram below shows the magnetic field lines between two magnetic poles, A and B. The south pole of the electromagnet is located closest to point A) A B) B C) C D) D 6. Base your answer to the following question on The diagram below shows electron e about to enter the region between the poles of two magnets. Which statement describes the polarity of magnetic poles A and B? A) Both A and B are south poles. B) A is a north pole and B is a south pole. C) A is a south pole and B is a north pole. D) Both A and B are north poles. 3. Which diagram best illustrates the magnetic field that exists around a current-carrying wire? A) B) C) D) 4. Which device can be used to convert mechanical energy into electrical energy? A) electroscope B) electromagnet C) electric motor D) electric generator Upon entering the region between the poles, the moving electron will experience a magnetic force directed A) into the page B) toward the north pole C) out of the page D) toward the south pole 7. Which expression is a unit of potential difference equivalent to a volt? A) B) C) D)

6 8. Base your answer to the following question on In the diagram below, a wire carrying an conventional current into the page, as denoted by X, is placed in a magnetic field. Base your answers to questions 10 and 11 on the information and diagram below. Two coils of wire are wound around the same permeable core. Coil I has 200. turns and coil II has turns. Coil I is supplied with 30.0 amperes of alternating current at 90.0 volts. The magnetic field exerts a force on the wire toward point A) C B) D C) A D) B 9. Base your answer to the following question on The diagram below shows an end view of a straight conducting wire, W, moving with constant speed in uniform magnetic field B. As the conductor moves through position P, the conventional current induced in the wire is directed A) into the page B) toward the top of the page C) toward the bottom of the page D) out of the page 10. What does the diagram above represent? A) a transistor B) a step-down transformer C) a step-up transformer D) an ammeter 11. What potential difference is induced in coil II? A) 6.00 V B) 2700 V C) 90.0 V D) 1350 V

7 Answer Key Magnetism Test 1. B 2. B 3. C 4. D 5. D 6. C 7. A 8. A 9. D 10. C 11. D

8 13. A particle executes uniform circular motion with speed v due to the influence of a magnetic force within a uniform magnetic field B. If the particle's charge is q, and the radius of the path of the particle is r, find an expression for the mass of the particle. 14. A) v 2 rqb B) rqb v 2 C) rqb v D) v rqb E) rqvb In the figure above, what is the direction of the particle's velocity? A) Out of the plane of the page B) Into the page C) Upward, in the plane of the page D) To the left E) To the right 15. Base your answer to the following question on the diagram below which shows two large parallel conducting plates connected to a battery of emf. A magnetic field is applied in the region in between the plates such that a particle with a positive charge traveling to the right in this region would feel no net force. What direction should this magnetic field point? A) towards the left B) out of the page C) towards the top of the page D) towards the right E) into the page 16. Two long, straight, parallel wires are placed a distance d apart. A current of I runs through each, in opposite directions. The force per unit length on each wire is 17. A) repulsive, magnitude (µ0/2 )I 2 /d B) attractive, magnitude (µ0/2 )I/d C) attractive, magnitude (µ0/2 )I 2 /d 2 D) repulsive, magnitude (µ0/2 )I 2 /d E) repulsive, magnitude (µ0/2 )I/d There is a clockwise current in a circular loop of wire in an external magnetic field directed out of the page as shown in the diagram above. The effect of the magnetic field is to make the loop A) rotate in the plane of the page. B) move into the page. C) rotate perpendicularly to the page. D) expand. E) contract. 18. If the resistance of a long straight wire is doubled and the voltage remains constant, the magnetic field produced by the wire A) increased by a factor of 2 B) the magnetic field is not influenced by a change in resistance C) decreases by a factor of 4 D) increase by a factor of 4 E) decreases by a factor of A square loop of copper wire enclosing an area of 0.10 m is initially placed perpendicular to a magnetic field of 2.0 T. The loop is rotates through 90 degrees, remaining perpendicular to the field. The turn takes 0.5 s. The average emf induced in the loop during the turn is A) 0.4 V B) 40 V C) 0 V D) 2.5 V E) 10 V

9 Base your answer to the following question on A rectangular wire loop is at rest in a magnetic field of magnitude 4 T, directed out of the page as shown above. The loop is 10 cm by 4 cm, and the plane of the loop is perpendicular to the field. The total magnetic flux through the loop is A) T m 2 B) 0 T m 2 C) T m 2 D) T m 2 E) T m Base your answer to the following question on The above diagram shows a metal loop of wire in a uniform magnetic field pointing into the page. If the magnetic field B uniformly decreases, the induced electric current within the loop is A) clockwise and constant. B) clockwise and increasing. C) counterclockwise and increasing. D) clockwise and decreasing. E) counterclockwise and decreasing. 23. Base your answer to the following question on In the diagram, a loop of wire with radius l rotates in a plane perpendicular to the uniform magnetic field B with constant velocity v. The emf induced in the loop is A) 2 Blv clockwise B) Bvl 2 clockwise C) 0 D) Bvl 2 counterclockwise E) 2 Blv counterclockwise A permanent bar magnet is pulled through a wire loop with a constant velocity as shown above. Which of the following best describes the current in the wire loop? (looking down on the loop from above) A) First counterclockwise, then changes to clockwise. B) First clockwise, then changes to counterclockwise. C) Always counterclockwise. D) Always clockwise. E) No current is induced in the loop.

10 Answer Key Magnetism AP Physics 13. C 14. B 15. B 16. D 17. E 18. E 19. C 20. E 21. C 22. A 23. A

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