Question 1

Magnetic fields are produced by

Accepted Answer

A) a tiny fraction of moving electrical charges. 
B) most moving electrical charges. 
C) all moving electrical charges. 
A) a tiny fraction of moving electrical charges. 
B) most moving electrical charges. 
C) all moving electrical charges. C

Question 2

The end of a compass needle that points to the south pole of a magnet is the

Accepted Answer

A) north pole. 
B) south pole. 
C) both of these 
A) north pole. 
B) south pole. 
C) both of these A

Question 3

Surrounding every moving electron is

Accepted Answer

A) a magnetic field. 
B) an electric field. 
C) both of these 
D) neither of these 
A) a magnetic field. 
B) an electric field. 
C) both of these 
D) neither of these C

Question 4

Refrigerator magnets are typically

Accepted Answer

A) short range. 
B) long range. 
C) none of these 
A) short range. 
B) long range. 
C) none of these

Question 5

A current-carrying wire in a magnetic field

Accepted Answer

A) may be deflected. 
B) may experience a force. 
C) both of these 
D) neither of these 
A) may be deflected. 
B) may experience a force. 
C) both of these 
D) neither of these

Question 6

Whereas electric charges can be isolated, magnetic poles

Accepted Answer

A) can also. 
B) cannot. 
C) gather in clusters. 
D) none of the above 
A) can also. 
B) cannot. 
C) gather in clusters. 
D) none of the above

Question 7

Magnetic field strength about a magnet is strongest where magnetic field lines are

Accepted Answer

A) closer together. 
B) straightest. 
C) most curved. 
D) more spread. 
A) closer together. 
B) straightest. 
C) most curved. 
D) more spread.

Question 8

A compass needle in a magnetic field

Accepted Answer

A) experiences a torque. 
B) experiences a pair of torques. 
C) may experience a pair of torques. 
A) experiences a torque. 
B) experiences a pair of torques. 
C) may experience a pair of torques.

Question 9

An iron rod becomes magnetic when

Accepted Answer

A) opposite ions accumulate at each end. 
B) its atoms are aligned. 
C) the net spins of many of its electrons are aligned. 
D) its electrons stop moving and point in the same direction. 
E) none of the above 
A) opposite ions accumulate at each end. 
B) its atoms are aligned. 
C) the net spins of many of its electrons are aligned. 
D) its electrons stop moving and point in the same direction. 
E) none of the above

Question 10

The direction of the force exerted on a moving charge in a magnetic field is

Accepted Answer

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

Question 11

Wood does not have magnetic properties because it contains no

Accepted Answer

A) iron or other metals. 
B) magnetic domains. 
C) moving electrons. 
D) none of the above 
A) iron or other metals. 
B) magnetic domains. 
C) moving electrons. 
D) none of the above

Question 12

The force that acts between a pair of magnetic poles depends on

Accepted Answer

A) magnetic pole strength. 
B) separation distance. 
C) both of these 
D) neither of these 
A) magnetic pole strength. 
B) separation distance. 
C) both of these 
D) neither of these

Question 13

As the number of loops in a current-carrying wire is increased, the

Accepted Answer

A) more spread out is the magnetic field. 
B) stronger the enclosed magnetic field. 
C) weaker the current. 
D) greater the back emf. 
A) more spread out is the magnetic field. 
B) stronger the enclosed magnetic field. 
C) weaker the current. 
D) greater the back emf.

Question 14

A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is

Accepted Answer

A) parallel to the field lines. 
B) perpendicular to the field lines. 
C) none of these 
A) parallel to the field lines. 
B) perpendicular to the field lines. 
C) none of these

Question 15

Which force field can increase a moving electron's speed?

Accepted Answer

A) electric field 
B) magnetic field 
C) both of these 
D) neither of these 
A) electric field 
B) magnetic field 
C) both of these 
D) neither of these

Question 16

Magnetic domains normally occur in

Accepted Answer

A) copper. 
B) silver. 
C) iron. 
D) all of the above 
E) none of the above 
A) copper. 
B) silver. 
C) iron. 
D) all of the above 
E) none of the above

Question 17

When an electron passes through the magnetic field of a horseshoe magnet, the electron's

Accepted Answer

A) speed is increased. 
B) direction is changed. 
C) both of these 
D) neither of these 
A) speed is increased. 
B) direction is changed. 
C) both of these 
D) neither of these

Question 18

No net force acts on a loop of wire in a magnetic field when

Accepted Answer

A) no current is in the loop. 
B) no magnetic field lines pass through the loop. 
C) both of these 
D) neither of these 
A) no current is in the loop. 
B) no magnetic field lines pass through the loop. 
C) both of these 
D) neither of these

Question 19

If a magnet produces a force on a current-carrying wire, the wire

Accepted Answer

A) produces a force on the magnet. 
B) may or may not produce a force on the magnet. 
C) none of these 
A) produces a force on the magnet. 
B) may or may not produce a force on the magnet. 
C) none of these

Question 20

Magnetism is due to the motion of electrons as they

Accepted Answer

A) move around the nucleus. 
B) spin on their axes. 
C) both of these 
D) neither of these 
A) move around the nucleus. 
B) spin on their axes. 
C) both of these 
D) neither of these

Exam 24: Magnetism

Magnetic fields are produced by

The end of a compass needle that points to the south pole of a magnet is the

Surrounding every moving electron is

Refrigerator magnets are typically

A current-carrying wire in a magnetic field

Whereas electric charges can be isolated, magnetic poles

Magnetic field strength about a magnet is strongest where magnetic field lines are

A compass needle in a magnetic field

An iron rod becomes magnetic when

The direction of the force exerted on a moving charge in a magnetic field is

Wood does not have magnetic properties because it contains no

The force that acts between a pair of magnetic poles depends on

As the number of loops in a current-carrying wire is increased, the

A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is

Which force field can increase a moving electron's speed?

Magnetic domains normally occur in

When an electron passes through the magnetic field of a horseshoe magnet, the electron's

No net force acts on a loop of wire in a magnetic field when

If a magnet produces a force on a current-carrying wire, the wire

Magnetism is due to the motion of electrons as they

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