1) Magnetic compasses reportedly were first used for navigation by |
c |
2) The source of all magnetism is |
d |
3) The force that acts between a pair of electrically-charged particles depends on |
c |
4) The force that acts between a pair of magnetic poles depends on |
c |
5) Like kinds of magnetic poles repel while unlike kinds of magnetic poles |
a |
7) Whereas electric charges can be isolated, magnetic poles |
b |
8) Refrigerator magnets are typically |
a |
9) If you break a bar magnet in half you'll |
b |
10) Surrounding every magnet is |
a |
11) Surrounding every stationary electron is |
b |
12) Surrounding every moving electron is |
c |
13) Magnetic fields are produced by |
c |
14) Magnetism is due to the motion of electrons as they |
c |
15) The conventional direction of magnetic field lines outside a magnet are from |
a |
16) Magnetic field strength about a magnet is strongest where magnetic field lines are |
a |
18) The magnetic fields of a pair of nearby magnets can |
c |
19) The end of a compass needle that points to the south pole of a magnet is the |
a |
22) In the atoms of most materials the fields of individual electrons |
a |
25) An iron nail is more strongly attracted to the |
c |
27) The shape of a magnetic field surrounding a current-carrying conductor is |
c |
28) Magnetic field lines about a current-carrying wire |
b |
29) When current reverses direction in a wire, the surrounding magnetic field |
a |
30) When a current-carrying wire is bent into a loop, its magnetic field inside the loop |
b |
31) As the number of loops in a current-carrying wire is increased, the |
b |
32) A beam of electrons passing through a magnetic field experiences maximum deflection if the direction of the beam is |
b |
33) A beam of electrons can pass through a magnetic field without being deflected if the direction of the beam is |
a |
35) A current-carrying coil of wire is |
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 |
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 |
b |
44) When an electron passes through the magnetic field of a horseshoe magnet, the electron's |
b |
45) The force exerted on an electron moving in a magnetic field is maximum when the electron moves |
b |
46) The force a magnetic field exerts on a current-carrying wire is maximum when the wire is oriented |
b |
47) A current-carrying wire in a magnetic field |
c |
48) An electron beam directed through a magnetic field |
c |
49) No net force acts on a loop of wire in a magnetic field when |
c |
52) A galvanometer can be calibrated to measure |
c |
53) Although a magnet can change the direction of travel of an electron beam, it cannot change its |
c |
55) Which force field can increase a moving electron's speed? |
a |
56) Which force field can accelerate an electron? |
c |
57) Over geologic history the Earth's magnetic field |
c |
58) Solar winds headed in Earth's direction are deviated mainly by |
c |
60) The intensity of cosmic rays bombarding the Earth's surface is most at the |
a |
61) An aurora borealis high above the atmosphere is due to |
d |
62) Cosmic rays penetrate your body when |
d |
63) Earth's magnetic field is |
c |
64) Pigeons navigate primarily by |
c |