Physics Chapter 24

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

Attract

Repel also

May attract or repel

2. Pigeons navigate primarily by

A good memory

A keen sense of smell

Magnetic sensors in their heads

Ultra-high pitched sounds

None of these

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

In the direction of the field

Opposite the direction of the field

At right angles to the direction of the field

4. Moving electric charges will interact with

An electric field

A magnetic field

Both of these

None of these

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

Electric field

Magnetic field

Both of these

None of these

6. The source of all magnetism is

Tiny pieces of iron

Tiny domains of aligned atoms

Ferromagnetic materials

Moving electric charge

None of these

7. 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

At or about 50 N

Exactly 100 N

More information is needed

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

Relatively small

Equally huge

More information is needed

9. Surrounding every moving electron is

A magnetic field

An electric field

Both of these

None of these

10. Magnetism is due to the motion of electrons as they

Move around the nucleus

Spin on their axes

Both of these

None of these

11. The intensity of cosmic rays bombarding the Earth's surface is largest at the

Poles

Mid-latitudes

Equator

12. Magnetic field lines about a current-carrying wire

Extend radially from the wire

Circle the wire in closed loops

Both of these

Neither of these

13. Which pole of a compass needle points to a south pole of a magnet?

North pole

South pole

Both of these

14. Superconducting electromagnets

Exist now

May be possible in the near future

May be possible in the distant future

Are science fiction

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

The same as the magnetic field direction

Exactly opposite tot he magnetic field direction

Perpendicular to the magnetic field direction

At an angle other than 90 degrees tot eh magnetic field direction

None of these

16. A possible cause for the existence of the Earth's magnetic field is

Moving charges in the liquid part of the Earth's core

Great numbers of very slow moving charges in the Earth

Convection currents in the liquid part of the Earth's core

All of these

None of these

17. Outside a magnet, magnetic field lines are conventionally drawn from

North to south

South to north

Either way

18. Magnetic domains normally occur in

Iron

Copper

Silver

All of these

None of these

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

Opposite the direction of the motion

In the direction of the motion

At right angles to the direction of the motion

20. Magnetic compasses apparently were first used by

Columbus

Greeks

Australian aborigines

Vikings

Pigeons, then Chinese

21. An iron nail is more strongly attracted to the

North pole of a magnet

South pole of a magnet

North or south pole- no difference really

22. If we think of the Earth as a magnet, its north (SEEKING) pole is nearest

The Hudson Bay region of Canada

Australia

Both of these

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

North pole

South pole

North or south pole-no difference really

24. When a bar magnet is broken in two as shown, each piece is

As magnetic as the original magnet

Actually stronger than the original magnet

At most half as strong as the original magnet

No longer magnetic

25. An iron rod becomes magnetic when

Positive ions accumulate at one end and negative ions at the other end

It atoms are aligned having plus charges on one side and negative charges on the other

The net spins of its electrons are in the same direction

Its electrons stop moving and point in the same direction

None of these

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

Electric field

Magnetic filed

Bother of these

None of these

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

By 180 degrees

Depending on where the measurement is taken

By 90 degrees

Hardly at all

None of these

28. An electron is hot from the right, toward a spot just between the ends of the magnet. the electron

Is unaffected by the field

Is attracted to one of the poles,and repelled from the other

Is repelled by both poles, and therefore is turned back

Is deflected into the plane of the page

Accelerates straight toward the spot