12 The strength of a magnet isA) greatest in the middleC) greatest at the polesB) the same all overD) greatest at only one end13. A magnet can be made byA) heating an iron nailC) placing an iron nail in the earthB) rubbing an iron nail with a magnetD) striking an iron nail14. When a bar magnet is broken in half,A) it loses its magnetismB) both halves are magnetsC) one half has one pole and the other half has another poleD) one half has two south poles and the other half has two north poles15. Which determines the direction of the force on a current-carrying wire in a magnetic field?direction of current in the wireII. amount of current in the wireIII. direction of magnetic fieldA) I onlyB) I and Il onlyC) I and III only1.D) Il and III onlyE) I, II, and III16. All magnets are characterized withA) two south polesC) permanent magnetismB) a shape like a barD) a magnetic field around them17. The total magnetic flux through a closed surface isA) always maximum B) dependent on the size of the closed surfaceC) zeroD) infinite18. A compass points toA) geographic north B) geographic eastC) magnetic northD) magnetic east19. The motion of a charged particle under the action of a magnetic field alone is always motion withC) constant velocity D) constantA) constant forceaccelerationB) constant speed20. The magnetic force on a current-carrying conductor depends on the following EXCEPTA) current flowing in the conductorC) length of the conductorB) mass of the conductorD) magnetic field21. A current is flowing west along a power line. If we neglect the earth's field, the direction of themagnetic field below it isA) EastC) SouthB) NorthD) West22. The magnetic field of a bar magnet most closely resembles of aA) current carrying wire loopB) horseshoe magnetC) straight current carrying wireD) stream of electrons moving parallel to one another

(12) The strength of a magnet is weakest at the center. Thus, option (A) is incorrect. The strength…

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

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

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Bar Magnet

In physics, magnetism is a phenomenon exhibited by a magnetic substance that exerts either attractive or repulsive force. A bar magnet is either a rectangular or round and hollow fit comprised of ferromagnetic materials and has a fanciful attractive field surrounded by it.

Question

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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