Question 1

Earth's magnetic field is

Accepted Answer

A) something we've learned to live with. 
B) useful to pigeons but not to humans. 
C) protective to life on Earth. 
A) something we've learned to live with. 
B) useful to pigeons but not to humans. 
C) protective to life on Earth.

Question 2

To weaken a bar magnet

Accepted Answer

A) drop it on a hard surface. 
B) put it in hot flames. 
C) whack it with a hammer. 
D) all of the above 
E) none of the above 
A) drop it on a hard surface. 
B) put it in hot flames. 
C) whack it with a hammer. 
D) all of the above 
E) none of the above

Question 3

A current-carrying coil of wire is

Accepted Answer

A) a superconductor. 
B) a superconducting magnet. 
C) an electromagnet. 
D) a magplane in the making. 
A) a superconductor. 
B) a superconducting magnet. 
C) an electromagnet. 
D) a magplane in the making.

Question 4

When a current-carrying wire is bent into a loop, its magnetic field inside the loop

Accepted Answer

A) weakens. 
B) becomes concentrated. 
C) cancels. 
D) none of the above 
A) weakens. 
B) becomes concentrated. 
C) cancels. 
D) none of the above

Question 5

Although a magnet can change the direction of travel of an electron beam, it cannot change its

Accepted Answer

A) speed 
B) kinetic energy. 
C) both of these 
D) neither of these 
A) speed 
B) kinetic energy. 
C) both of these 
D) neither of these

Question 6

A superconducting magnet uses

Accepted Answer

A) iron cores. 
B) superconducting coils. 
C) both of these 
D) neither of these 
A) iron cores. 
B) superconducting coils. 
C) both of these 
D) neither of these

Question 7

The force a magnetic field exerts on a current-carrying wire is maximum when the wire is oriented

Accepted Answer

A) parallel to the magnetic field. 
B) perpendicular to the magnetic field. 
C) either of these 
D) neither of these 
A) parallel to the magnetic field. 
B) perpendicular to the magnetic field. 
C) either of these 
D) neither of these

Question 8

The force that acts between a pair of electrically-charged particles depends on

Accepted Answer

A) magnitude of charge. 
B) separation distance. 
C) both of these 
D) neither of these 
A) magnitude of charge. 
B) separation distance. 
C) both of these 
D) neither of these

Question 9

Which force field can accelerate an electron?

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 10

If you break a bar magnet in half you'll

Accepted Answer

A) destroy its magnetic properties. 
B) have two magnets. 
C) have two and a half magnets. 
D) none of the above 
A) destroy its magnetic properties. 
B) have two magnets. 
C) have two and a half magnets. 
D) none of the above

Question 11

A current-carrying loop of wire experiences no tendency to rotate in a magnetic field when

Accepted Answer

A) field lines pass directly through the loop. 
B) no field lines pass through the loop. 
C) none of these 
A) field lines pass directly through the loop. 
B) no field lines pass through the loop. 
C) none of these

Question 12

If a compass is moved from the Northern Hemisphere to the Southern Hemisphere, its magnetic needle will change direction

Accepted Answer

A) randomly and rapidly 
B) by 90 degrees. 
C) by 180 degrees. 
D) hardly at all. 
A) randomly and rapidly 
B) by 90 degrees. 
C) by 180 degrees. 
D) hardly at all.

Question 13

A galvanometer indicates

Accepted Answer

A) electric charge. 
B) a flow of electrons. 
C) electric voltage. 
D) magnetic field strength. 
A) electric charge. 
B) a flow of electrons. 
C) electric voltage. 
D) magnetic field strength.

Question 14

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) either of these 
D) neither of these 
A) north pole. 
B) south pole. 
C) either of these 
D) neither of these

Question 15

In the atoms of most materials the fields of individual electrons

Accepted Answer

A) cancel one another. 
B) partly align. 
C) completely align. 
A) cancel one another. 
B) partly align. 
C) completely align.

Question 16

The conventional direction of magnetic field lines outside a magnet are 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 17

The force exerted on an electron moving in a magnetic field is maximum when the electron moves

Accepted Answer

A) parallel to the magnetic field. 
B) perpendicular to the magnetic field. 
C) either of these 
D) neither of these 
A) parallel to the magnetic field. 
B) perpendicular to the magnetic field. 
C) either of these 
D) neither of these

Question 18

An aurora borealis high above the atmosphere is due to

Accepted Answer

A) disturbances in Earth's magnetic field. 
B) fountains of high-speed charged particles. 
C) trapping of charged particles by Earth's magnetic field. 
D) all of the above 
A) disturbances in Earth's magnetic field. 
B) fountains of high-speed charged particles. 
C) trapping of charged particles by Earth's magnetic field. 
D) all of the above

Question 19

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) inversely proportional to their masses. 
A) relatively small. 
B) equally huge. 
C) inversely proportional to their masses.

Question 20

Solar winds headed in Earth's direction are deviated mainly by

Accepted Answer

A) the upper atmosphere. 
B) the troposphere. 
C) Earth's magnetic field. 
D) Earth's radiation belts. 
A) the upper atmosphere. 
B) the troposphere. 
C) Earth's magnetic field. 
D) Earth's radiation belts.

Exam 24: Magnetism

Earth's magnetic field is

To weaken a bar magnet

A current-carrying coil of wire is

When a current-carrying wire is bent into a loop, its magnetic field inside the loop

Although a magnet can change the direction of travel of an electron beam, it cannot change its

A superconducting magnet uses

The force a magnetic field exerts on a current-carrying wire is maximum when the wire is oriented

The force that acts between a pair of electrically-charged particles depends on

Which force field can accelerate an electron?

If you break a bar magnet in half you'll

A current-carrying loop of wire experiences no tendency to rotate in a magnetic field when

If a compass is moved from the Northern Hemisphere to the Southern Hemisphere, its magnetic needle will change direction

A galvanometer indicates

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

In the atoms of most materials the fields of individual electrons

The conventional direction of magnetic field lines outside a magnet are from

The force exerted on an electron moving in a magnetic field is maximum when the electron moves

An aurora borealis high above the atmosphere is due to

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

Solar winds headed in Earth's direction are deviated mainly by

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