Question 1

A galvanometer indicates

Accepted Answer

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

Question 2

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.

Question 3

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

Question 4

Which force field can accelerate an electron?

Accepted Answer

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

Question 5

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

Question 6

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.

Question 7

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

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

Question 9

A superconducting magnet uses

Accepted Answer

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

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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.

Question 15

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.

Question 16

In the atoms of most materials the fields of individual electrons

Accepted Answer

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

Question 17

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.

Question 18

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

Question 19

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

Question 20

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

Exam 24: Magnetism

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

A current-carrying coil of wire is

Correct AnswerverifiedShow Answer

A galvanometer indicates

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

To weaken a bar magnet

Correct AnswerverifiedShow Answer

Earth's magnetic field is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In the atoms of most materials the fields of individual electrons

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An aurora borealis high above the atmosphere is due to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which force field can accelerate an electron?

Correct AnswerverifiedShow Answer

If you break a bar magnet in half you'll

Correct AnswerverifiedShow Answer

A superconducting magnet uses

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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