# 3. Physics Practice Questions- Chapter 24

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http://www.southernct.edu/~bidarian/phy1xx-chap24.htm

### D

1) The source of all magnetism is
A) tiny pieces of iron.
B) tiny domains of aligned atoms.
C) ferromagnetic materials.
D) moving electric charge.
E) none of these.

### E

2) Magnetic compasses apparently were first used by
A) Columbus.
B) Greeks.
C) Australian aborigines.
D) Vikings.
E) pigeons, then Chinese.

### C

3) Moving electric charges will interact with
A) an electric field. B) a magnetic field.
C) both of these. D) none of these.

### C

4) If a steady magnetic field exerts a force on a moving charge, that force is directed
A) opposite the motion.
B) in the direction of the motion.
C) at right angles to the direction of the motion.

### C

5) If a steady magnetic field exerts a force on a moving charge, that force is directed
A) in the direction of the field.
B) opposite the direction of the field.
C) at right angles to the direction of the field.

### C

6) An iron rod becomes magnetic when
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

7) Like kinds of magnetic poles repel while unlike kinds of magnetic poles
A) attract. B) repel also. C) may attract or repel.

### A

8) Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a
A) north pole.
B) south pole.
C) north or south pole - no difference really.

### C

9) An iron nail is more strongly attracted to the
A) north pole of a magnet.
B) south pole of a magnet.
C) north or south pole - no difference really.

### C

10) Surrounding every moving electron is
A) a magnetic field. B) an electric field.
C) both of these. D) none of these.

### C

11) Magnetism is due to the motion of electrons as they
A) move around the nucleus. B) spin on their axes.
C) both of these. D) none of these.

### A

12) Magnetic domains normally occur in
A) iron.
B) copper.
C) silver.
D) all of these.
E) none of these.

### B

13) Magnetic field lines about a current-carrying wire
A) extend radially from the wire. B) circle the wire in closed loops.
C) both of these. D) neither of these.

### C

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

15) The intensity of cosmic rays bombarding the Earth's surface is largest at the
A) poles. B) mid-latitudes. C) equator.

### B

16) If we think of the Earth as a magnet, its north (-seeking) pole is nearest
A) the Hudson Bay region of Canada.
B) Australia.
C) both of these.

### A

17) Which pole of a compass needle points to a south pole of a magnet?
A) north pole B) south pole C) both of these

### C

18) Pigeons navigate primarily by
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.

### B

19) 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
A) at or about 50 N.
B) exactly 100 N.

### B

20) Compared to the huge force that attracts an iron tack to a strong magnet, the force that the tack exerts on the magnet is
A) relatively small.
B) equally huge.

### D

21) An electron is shot from the right, toward a spot just between the ends of the magnet. The electron
A) is unaffected by the field.
B) is attracted to one of the poles, and repelled from the other.
C) is repelled by both poles, and therefore is turned back.
D) is deflected into the plane of the page.
E) accelerates straight toward the spot.

### D

22) If a compass is moved from the northern hemisphere to the southern hemisphere, its magnetic needle will change direction
A) by 180 degrees.
B) depending on where the measurement is taken.
C) by 90 degrees.
D) hardly at all.
E) none of these

### D

23) A possible cause for the existence of the Earth's magnetic field is
A) moving charges in the liquid part of the Earth's core.
B) great numbers of very slow moving charges in the Earth.
C) convection currents in the liquid part of the Earth's core.
D) all of these.
E) none of these.

### A

24) Outside a magnet, magnetic field lines are conventionally drawn from
A) north to south. B) south to north. C) either way.

### A

25) Which force field can increase a moving electron's speed?
A) electric field B) magnetic field C) both of these D) none of these

### B

26) Which force field can accelerate an electron, but never change its speed?
A) electric field B) magnetic field C) both of these D) none of these

### C

27) When a bar magnet is broken in two as shown, each piece is
A) as magnetic as the original magnet.
B) actually stronger than the original magnet.
C) at most half as strong as the original magnet.
D) no longer magnetic.

### A

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

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