chapter 24 physics 101

1) Magnetic compasses reportedly were first used for navigation by
A) Aristotle.
B) Australian aborigines.
C) Chinese sailors.
D) none of the above

c

2) 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 the above

d

3) The force that acts between a pair of electrically-charged particles depends on
A) magnitude of charge.
B) separation distance.
C) both of these
D) neither of these

c

4) The force that acts between a pair of magnetic poles depends on
A) magnetic pole strength.
B) separation distance.
C) both of these
D) neither of these

c

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

a

7) Whereas electric charges can be isolated, magnetic poles
A) can also.
B) cannot.
C) gather in clusters.
D) none of the above

b

8) Refrigerator magnets are typically
A) short range.
B) long range.
C) none of these

a

9) If you break a bar magnet in half you'll
A) destroy its magnetic properties.
B) have two magnets.
C) have two and a half magnets.
D) none of the above

b

10) Surrounding every magnet is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these

a

11) Surrounding every stationary electron is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these

b

12) Surrounding every moving electron is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these

c

13) Magnetic fields are produced by
A) a tiny fraction of moving electrical charges.
B) most moving electrical charges.
C) all moving electrical charges.

c

14) 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) neither of these

c

15) The conventional direction of magnetic field lines outside a magnet are from
A) north to south.
B) south to north.
C) either way

a

16) Magnetic field strength about a magnet is strongest where magnetic field lines are
A) closer together.
B) straightest.
C) most curved.
D) more spread.

a

18) The magnetic fields of a pair of nearby magnets can
A) only add.
B) cannot add or subtract.
C) add or subtract by vector rules.

c

19) The end of a compass needle that points to the south pole of a magnet is the
A) north pole.
B) south pole.
C) both of these

a

22) In the atoms of most materials the fields of individual electrons
A) cancel one another.
B) partly align.
C) completely align.

a

25) An iron nail is more strongly attracted to the
A) north pole of a magnet.
B) south pole of a magnet.
C) either of these
D) neither of these

c

27) The shape of a magnetic field surrounding a current-carrying conductor is
A) consistent with the inverse-square law.
B) radial.
C) circular.
D) all of these
E) neither of these

c

28) 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

b

29) When current reverses direction in a wire, the surrounding magnetic field
A) also reverses direction.
B) becomes momentarily stronger.
C) contracts.
D) expands.

a

30) When a current-carrying wire is bent into a loop, its magnetic field inside the loop
A) weakens.
B) becomes concentrated.
C) cancels.
D) none of the above

b

31) As the number of loops in a current-carrying wire is increased, the
A) more spread out is the magnetic field.
B) stronger the enclosed magnetic field.
C) weaker the current.
D) greater the back emf.

b

32) A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is
A) parallel to the field lines.
B) perpendicular to the field lines.
C) none of these

b

33) A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is
A) parallel to the field lines.
B) perpendicular to the field lines.
C) none of these

a

35) A current-carrying coil of wire is
A) a superconductor.
B) a superconducting magnet.
C) an electromagnet.
D) a magplane in the making.

c

39) 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.
C) need more information

b

40) 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.
C) inversely proportional to their masses.

b

44) When an electron passes through the magnetic field of a horseshoe magnet, the electron's
A) speed is increased.
B) direction is changed.
C) both of these
D) neither of these

b

45) The force exerted on an electron moving in a magnetic field is maximum when the electron moves
A) parallel to the magnetic field.
B) perpendicular to the magnetic field.
C) either of these
D) neither of these

b

46) The force a magnetic field exerts on a current-carrying wire is maximum when the wire is oriented
A) parallel to the magnetic field.
B) perpendicular to the magnetic field.
C) either of these
D) neither of these

b

47) A current-carrying wire in a magnetic field
A) may be deflected.
B) may experience a force.
C) both of these
D) neither of these

c

48) An electron beam directed through a magnetic field
A) may be deflected.
B) may experience a force.
C) both of these
D) neither of these

c

49) No net force acts on a loop of wire in a magnetic field when
A) no current is in the loop.
B) no magnetic field lines pass through the loop.
C) both of these
D) neither of these

c

52) A galvanometer can be calibrated to measure
A) electric current.
B) electric voltage.
C) both of these
D) none of these

c

53) Although a magnet can change the direction of travel of an electron beam, it cannot change its
A) speed
B) kinetic energy.
C) both of these
D) neither of these

c

55) Which force field can increase a moving electron's speed?
A) electric field
B) magnetic field
C) both of these
D) neither of these

a

56) Which force field can accelerate an electron?
A) electric field
B) magnetic field
C) both of these
D) neither of these

c

57) Over geologic history the Earth's magnetic field
A) has been relatively stable.
B) has increased in strength exponentially.
C) has reversed direction many times.
D) is unknown.

c

58) Solar winds headed in Earth's direction are deviated mainly by
A) the upper atmosphere.
B) the troposphere.
C) Earth's magnetic field.
D) Earth's radiation belts.

c

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

a

61) An aurora borealis high above the atmosphere is due to
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

d

62) Cosmic rays penetrate your body when
A) safely in your home.
B) outdoors.
C) in mountainous regions.
D) all of the above
E) none of the above

d

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

c

64) 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 the above

c

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chapter 24 physics 101

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1) Magnetic compasses reportedly were first used for navigation by
A) Aristotle.
B) Australian aborigines.
C) Chinese sailors.
D) none of the above

c

2) 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 the above

d

3) The force that acts between a pair of electrically-charged particles depends on
A) magnitude of charge.
B) separation distance.
C) both of these
D) neither of these

c

4) The force that acts between a pair of magnetic poles depends on
A) magnetic pole strength.
B) separation distance.
C) both of these
D) neither of these

c

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

a

7) Whereas electric charges can be isolated, magnetic poles
A) can also.
B) cannot.
C) gather in clusters.
D) none of the above

b

8) Refrigerator magnets are typically
A) short range.
B) long range.
C) none of these

a

9) If you break a bar magnet in half you’ll
A) destroy its magnetic properties.
B) have two magnets.
C) have two and a half magnets.
D) none of the above

b

10) Surrounding every magnet is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these

a

11) Surrounding every stationary electron is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these

b

12) Surrounding every moving electron is
A) a magnetic field.
B) an electric field.
C) both of these
D) neither of these

c

13) Magnetic fields are produced by
A) a tiny fraction of moving electrical charges.
B) most moving electrical charges.
C) all moving electrical charges.

c

14) 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) neither of these

c

15) The conventional direction of magnetic field lines outside a magnet are from
A) north to south.
B) south to north.
C) either way

a

16) Magnetic field strength about a magnet is strongest where magnetic field lines are
A) closer together.
B) straightest.
C) most curved.
D) more spread.

a

18) The magnetic fields of a pair of nearby magnets can
A) only add.
B) cannot add or subtract.
C) add or subtract by vector rules.

c

19) The end of a compass needle that points to the south pole of a magnet is the
A) north pole.
B) south pole.
C) both of these

a

22) In the atoms of most materials the fields of individual electrons
A) cancel one another.
B) partly align.
C) completely align.

a

25) An iron nail is more strongly attracted to the
A) north pole of a magnet.
B) south pole of a magnet.
C) either of these
D) neither of these

c

27) The shape of a magnetic field surrounding a current-carrying conductor is
A) consistent with the inverse-square law.
B) radial.
C) circular.
D) all of these
E) neither of these

c

28) 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

b

29) When current reverses direction in a wire, the surrounding magnetic field
A) also reverses direction.
B) becomes momentarily stronger.
C) contracts.
D) expands.

a

30) When a current-carrying wire is bent into a loop, its magnetic field inside the loop
A) weakens.
B) becomes concentrated.
C) cancels.
D) none of the above

b

31) As the number of loops in a current-carrying wire is increased, the
A) more spread out is the magnetic field.
B) stronger the enclosed magnetic field.
C) weaker the current.
D) greater the back emf.

b

32) A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is
A) parallel to the field lines.
B) perpendicular to the field lines.
C) none of these

b

33) A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is
A) parallel to the field lines.
B) perpendicular to the field lines.
C) none of these

a

35) A current-carrying coil of wire is
A) a superconductor.
B) a superconducting magnet.
C) an electromagnet.
D) a magplane in the making.

c

39) 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.
C) need more information

b

40) 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.
C) inversely proportional to their masses.

b

44) When an electron passes through the magnetic field of a horseshoe magnet, the electron’s
A) speed is increased.
B) direction is changed.
C) both of these
D) neither of these

b

45) The force exerted on an electron moving in a magnetic field is maximum when the electron moves
A) parallel to the magnetic field.
B) perpendicular to the magnetic field.
C) either of these
D) neither of these

b

46) The force a magnetic field exerts on a current-carrying wire is maximum when the wire is oriented
A) parallel to the magnetic field.
B) perpendicular to the magnetic field.
C) either of these
D) neither of these

b

47) A current-carrying wire in a magnetic field
A) may be deflected.
B) may experience a force.
C) both of these
D) neither of these

c

48) An electron beam directed through a magnetic field
A) may be deflected.
B) may experience a force.
C) both of these
D) neither of these

c

49) No net force acts on a loop of wire in a magnetic field when
A) no current is in the loop.
B) no magnetic field lines pass through the loop.
C) both of these
D) neither of these

c

52) A galvanometer can be calibrated to measure
A) electric current.
B) electric voltage.
C) both of these
D) none of these

c

53) Although a magnet can change the direction of travel of an electron beam, it cannot change its
A) speed
B) kinetic energy.
C) both of these
D) neither of these

c

55) Which force field can increase a moving electron’s speed?
A) electric field
B) magnetic field
C) both of these
D) neither of these

a

56) Which force field can accelerate an electron?
A) electric field
B) magnetic field
C) both of these
D) neither of these

c

57) Over geologic history the Earth’s magnetic field
A) has been relatively stable.
B) has increased in strength exponentially.
C) has reversed direction many times.
D) is unknown.

c

58) Solar winds headed in Earth’s direction are deviated mainly by
A) the upper atmosphere.
B) the troposphere.
C) Earth’s magnetic field.
D) Earth’s radiation belts.

c

60) The intensity of cosmic rays bombarding the Earth’s surface is most at the
A) poles.
B) mid-latitudes.
C) equator.

a

61) An aurora borealis high above the atmosphere is due to
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

d

62) Cosmic rays penetrate your body when
A) safely in your home.
B) outdoors.
C) in mountainous regions.
D) all of the above
E) none of the above

d

63) Earth’s magnetic field is
A) something we’ve learned to live with.
B) useful to pigeons but not to humans.
C) protective to life on Earth.

c

64) 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 the above

c

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