Question 1

An iron rod becomes magnetic when

Accepted Answer

A) positive ions accumulate at one end and negative ions at the other end. 
B) its atoms are aligned having plus charges on one side and negative charges on the other. 
C) the net spins of its electrons are in the same direction. 
D) its electrons stop moving and point in the same direction. 
E) none of these 
A) positive ions accumulate at one end and negative ions at the other end. 
B) its atoms are aligned having plus charges on one side and negative charges on the other. 
C) the net spins of its electrons are in the same direction. 
D) its electrons stop moving and point in the same direction. 
E) none of these C

Question 2

If a steady magnetic field exerts a force on a moving charge,that force is directed

Accepted Answer

A) opposite the motion. 
B) in the direction of the motion. 
C) at right angles to the direction of the motion. 
A) opposite the motion. 
B) in the direction of the motion. 
C) at right angles to the direction of the motion. C

Question 3

The source of all magnetism is

Accepted Answer

A) tiny pieces of iron. 
B) tiny domains of aligned atoms. 
C) ferromagnetic materials. 
D) moving electric charge. 
E) none of these 
A) tiny pieces of iron. 
B) tiny domains of aligned atoms. 
C) ferromagnetic materials. 
D) moving electric charge. 
E) none of these D

Question 4

An iron nail is more strongly attracted to the

Accepted Answer

A) north pole of a magnet. 
B) south pole of a magnet. 
C) north or south pole - no difference really. 
A) north pole of a magnet. 
B) south pole of a magnet. 
C) north or south pole - no difference really.

Question 5

Which force field can accelerate an electron,but never change its speed?

Accepted Answer

A) electric field 
B) magnetic field 
C) both of these 
D) none of these 
A) electric field 
B) magnetic field 
C) both of these 
D) none of these

Question 6

Outside a magnet,magnetic field lines are conventionally drawn from

Accepted Answer

A) north to south. 
B) south to north. 
C) either way 
A) north to south. 
B) south to north. 
C) either way

Question 7

Magnetism is due to the motion of electrons as they

Accepted Answer

A) move around the nucleus. 
B) spin on their axes. 
C) Choices A and B are both correct. 
D) None of the above choices are correct. 
A) move around the nucleus. 
B) spin on their axes. 
C) Choices A and B are both correct. 
D) None of the above choices are correct.

Question 8

Superconducting electromagnets

Accepted Answer

A) exist now. 
B) may be possible in the near future. 
C) may be possible in the distant future. 
D) are science fiction. 
A) exist now. 
B) may be possible in the near future. 
C) may be possible in the distant future. 
D) are science fiction.

Question 9

Magnetic compasses apparently were first used by

Accepted Answer

A) Columbus. 
B) Greeks. 
C) Australian aborigines. 
D) Vikings. 
E) pigeons,then Chinese. 
A) Columbus. 
B) Greeks. 
C) Australian aborigines. 
D) Vikings. 
E) pigeons,then Chinese.

Question 10

The field surrounding every moving electron is

Accepted Answer

A) always magnetic but never electric. 
B) always electric but never magnetic. 
C) sometimes magnetic and sometimes electric. 
D) always both electric and magnetic. 
E) none of the above 
A) always magnetic but never electric. 
B) always electric but never magnetic. 
C) sometimes magnetic and sometimes electric. 
D) always both electric and magnetic. 
E) none of the above

Question 11

If a compass is moved from the northern hemisphere to the southern hemisphere,its magnetic needle will change direction

Accepted Answer

A) by 180 degrees. 
B) depending on where the measurement is taken. 
C) by 90 degrees. 
D) hardly at all. 
E) none of these 
A) by 180 degrees. 
B) depending on where the measurement is taken. 
C) by 90 degrees. 
D) hardly at all. 
E) none of these

Question 12

Compared to the huge force that attracts an iron tack to a strong magnet,the force that the tack exerts on the magnet is

Accepted Answer

A) relatively small. 
B) equally huge. 
C) More information is needed. 
A) relatively small. 
B) equally huge. 
C) More information is needed.

Question 13

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

Accepted Answer

A) attract. 
B) repel also. 
C) may attract or repel. 
A) attract. 
B) repel also. 
C) may attract or repel.

Question 14

Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N.The amount of force that magnet A exerts on magnet B is

Accepted Answer

A) at or about 50 N. 
B) exactly 100 N. 
C) More information is needed. 
A) at or about 50 N. 
B) exactly 100 N. 
C) More information is needed.

Question 15

Pigeons navigate primarily by

Accepted Answer

A) a good memory. 
B) a keen sense of smell. 
C) magnetic sensors in their heads. 
D) ultra-high-pitched sounds. 
E) none of these 
A) a good memory. 
B) a keen sense of smell. 
C) magnetic sensors in their heads. 
D) ultra-high-pitched sounds. 
E) none of these

Question 16

Several paper clips dangle from the north pole of a magnet.The induced pole in the bottom of the lowermost paper clip is a

Accepted Answer

A) north pole. 
B) south pole. 
C) north or south pole - no difference really. 
A) north pole. 
B) south pole. 
C) north or south pole - no difference really.

Question 17

Moving electric charges will interact with

Accepted Answer

A) an electric field or a magnetic field. 
B) only a magnetic field. 
C) only an electric field. 
D) none of these 
A) an electric field or a magnetic field. 
B) only a magnetic field. 
C) only an electric field. 
D) none of these

Question 18

The force on an electron moving in a magnetic field will be the largest when its direction is

Accepted Answer

A) the same as the magnetic field direction. 
B) exactly opposite to the magnetic field direction. 
C) perpendicular to the magnetic field direction. 
D) at an angle other than 90 degrees to the magnetic field direction. 
E) none of these 
A) the same as the magnetic field direction. 
B) exactly opposite to the magnetic field direction. 
C) perpendicular to the magnetic field direction. 
D) at an angle other than 90 degrees to the magnetic field direction. 
E) none of these

Question 19

An electron is shot through a spot somewhere between the ends of a horseshoe magnet.The electron

Accepted Answer

A) is unaffected by the field. 
B) is attracted to one of the poles,and repelled by the other. 
C) is repelled by both poles,and therefore is turned back. 
D) speed is increased. 
E) direction is changed. 
A) is unaffected by the field. 
B) is attracted to one of the poles,and repelled by the other. 
C) is repelled by both poles,and therefore is turned back. 
D) speed is increased. 
E) direction is changed.

Question 20

If a steady magnetic field exerts a force on a moving charge,that force is directed

Accepted Answer

A) in the direction of the field. 
B) opposite the direction of the field. 
C) at right angles to the direction of the field. 
A) in the direction of the field. 
B) opposite the direction of the field. 
C) at right angles to the direction of the field.

Exam 24: Magnetism

An iron rod becomes magnetic when

If a steady magnetic field exerts a force on a moving charge,that force is directed

The source of all magnetism is

An iron nail is more strongly attracted to the

Which force field can accelerate an electron,but never change its speed?

Outside a magnet,magnetic field lines are conventionally drawn from

Magnetism is due to the motion of electrons as they

Superconducting electromagnets

Magnetic compasses apparently were first used by

The field surrounding every moving electron is

If a compass is moved from the northern hemisphere to the southern hemisphere,its magnetic needle will change direction

Compared to the huge force that attracts an iron tack to a strong magnet,the force that the tack exerts on the magnet is

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N.The amount of force that magnet A exerts on magnet B is

Pigeons navigate primarily by

Several paper clips dangle from the north pole of a magnet.The induced pole in the bottom of the lowermost paper clip is a

Moving electric charges will interact with

The force on an electron moving in a magnetic field will be the largest when its direction is

An electron is shot through a spot somewhere between the ends of a horseshoe magnet.The electron

If a steady magnetic field exerts a force on a moving charge,that force is directed

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