12. The strength of a magnet is A) greatest in the middle C) greatest at the poles B) the same all over D) greatest at only one end 13. A magnet can be made by A) heating an iron nail C) placing an iron nail in the earth B) rubbing an iron nail with a magnet D) striking an iron nail

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12 The strength of a magnet is
A) greatest in the middle
C) greatest at the poles
B) the same all over
D) greatest at only one end
13. A magnet can be made by
A) heating an iron nail
C) placing an iron nail in the earth
B) rubbing an iron nail with a magnet
D) striking an iron nail
14. When a bar magnet is broken in half,
A) it loses its magnetism
B) both halves are magnets
C) one half has one pole and the other half has another pole
D) one half has two south poles and the other half has two north poles
15. Which determines the direction of the force on a current-carrying wire in a magnetic field?
direction of current in the wire
II. amount of current in the wire
III. direction of magnetic field
A) I only
B) I and Il only
C) I and III only
1.
D) Il and III only
E) I, II, and III
16. All magnets are characterized with
A) two south poles
C) permanent magnetism
B) a shape like a bar
D) a magnetic field around them
17. The total magnetic flux through a closed surface is
A) always maximum B) dependent on the size of the closed surface
C) zero
D) infinite
18. A compass points to
A) geographic north B) geographic east
C) magnetic north
D) magnetic east
19. The motion of a charged particle under the action of a magnetic field alone is always motion with
C) constant velocity D) constant
A) constant force
acceleration
B) constant speed
20. The magnetic force on a current-carrying conductor depends on the following EXCEPT
A) current flowing in the conductor
C) length of the conductor
B) mass of the conductor
D) magnetic field
21. A current is flowing west along a power line. If we neglect the earth's field, the direction of the
magnetic field below it is
A) East
C) South
B) North
D) West
22. The magnetic field of a bar magnet most closely resembles of a
A) current carrying wire loop
B) horseshoe magnet
C) straight current carrying wire
D) stream of electrons moving parallel to one another
Transcribed Image Text:12 The strength of a magnet is A) greatest in the middle C) greatest at the poles B) the same all over D) greatest at only one end 13. A magnet can be made by A) heating an iron nail C) placing an iron nail in the earth B) rubbing an iron nail with a magnet D) striking an iron nail 14. When a bar magnet is broken in half, A) it loses its magnetism B) both halves are magnets C) one half has one pole and the other half has another pole D) one half has two south poles and the other half has two north poles 15. Which determines the direction of the force on a current-carrying wire in a magnetic field? direction of current in the wire II. amount of current in the wire III. direction of magnetic field A) I only B) I and Il only C) I and III only 1. D) Il and III only E) I, II, and III 16. All magnets are characterized with A) two south poles C) permanent magnetism B) a shape like a bar D) a magnetic field around them 17. The total magnetic flux through a closed surface is A) always maximum B) dependent on the size of the closed surface C) zero D) infinite 18. A compass points to A) geographic north B) geographic east C) magnetic north D) magnetic east 19. The motion of a charged particle under the action of a magnetic field alone is always motion with C) constant velocity D) constant A) constant force acceleration B) constant speed 20. The magnetic force on a current-carrying conductor depends on the following EXCEPT A) current flowing in the conductor C) length of the conductor B) mass of the conductor D) magnetic field 21. A current is flowing west along a power line. If we neglect the earth's field, the direction of the magnetic field below it is A) East C) South B) North D) West 22. The magnetic field of a bar magnet most closely resembles of a A) current carrying wire loop B) horseshoe magnet C) straight current carrying wire D) stream of electrons moving parallel to one another
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