Download Magnetic Jeopardy

Magnetic Review
3. The magnetic pole of the Earth nearest the geographic
North Pole corresponds to which of the following?
a.
b.
c.
d.
a magnetic north pole
a magnetic south pole
a magnetic arctic pole
a magnetic antarctic pole
4. An electron which moves with a speed of 3.0  104 m/s
parallel to a uniform magnetic field of 0.40 T experiences
a force of what magnitude? (e = 1.6  1019 C)
5. Assume that a uniform magnetic field is directed into this page.
If an electron is released with an initial velocity directed from the
bottom edge to the top edge of the page, which of the following
describes the direction of the resultant force acting on the electron?
a.
b.
c.
d.
e.
out of the page
to the right
to the left
into the page
from top edge to bottom edge of the page
6. A proton is released such that its initial velocity is from right to
left across this page. The proton's path, however, is deflected in a
direction toward the bottom edge of the page due to the presence of a
uniform magnetic field. What is the direction of this field?
a.
out of the page
b.
into the page
c.
from bottom edge to top edge of the page
d.
e.
from right to left across the page
from left to right across the page
7. There is a magnetic force on a particle. It is
possible that the particle is:
a.
b.
c.
d.
e.
uncharged.
stationary.
moving in the direction of the magnetic field.
not part of a wire.
moving opposite the direction of the magnetic
field.
8. A 2.0-m wire segment carrying a current of 0.60
A oriented parallel to a uniform magnetic field of
0.50 T experiences a force of what magnitude?
a.
b.
c.
d.
e.
6.7 N
0.30 N
0.15 N
0.60 N
zero
9. A copper wire of length 25 cm is in a magnetic field of 0.20 T. If
it has a mass of 10 g, what is the minimum current through the wire
that would cause a magnetic force equal to its weight?
a.
b.
c.
d.
e.
1.3 A
1.5 A
2.0 A
4.9 A
5.2 A
10. A horizontal wire of length 3.0 m carries a current of 6.0 A and
is oriented so that the current direction is 50 S of W. The Earth's
magnetic field is due north at this point and has a strength of 0.14 
104 T. What is the direction of the force on the wire?
a.
b.
c.
d.
e.
out of the Earth's surface
toward the Earth's surface
due east
40 S of E
due west
12. The path of a charged particle moving parallel to a
uniform magnetic field will be a:
a.
b.
c.
d.
e.
straight line.
circle.
ellipse.
parabola.
hyperbola.
13. Magnetism had been a known phenomenon for some time
before its relation to electric currents was found. That a current
in a wire produces a magnetic field was discovered by:
a.
b.
c.
d.
e.
Maxwell.
Ampere.
Oersted.
Tesla.
Faraday.
14. A current in a long, straight wire produces a magnetic
field. The magnetic field lines:
a.
b.
go out from the wire to infinity.
come in from infinity to the wire.
c.
form circles that pass through the wire.
d.
form circles that go around the wire.
e.
are parallel to the wire.
18. According to Lenz's law the direction of an induced
current in a conductor will be that which tends to produce
which of the following effects?
a.
enhance the effect which produces it
b.
produce a greater heating effect
c.
produce the greatest voltage
d.
oppose the effect which produces it
e.
produce the greatest magnetic field
21. A coil is placed in a changing magnetic field and an emf
is induced. What happens to the induced emf if the rate of
change of magnetic field quadruples?
a.
b.
There is no change.
The emf doubles.
c.
d.
e.
The emf quadruples.
The emf increases by a factor of 16.
The emf halves.