The pointer on a compass is the
north pole of a small magnet. If a compass were placed next to a
bar magnet, as shown above, in what direction would the pointer
point?
(A)
(B)
(C)
(D)
(E)
2.
A
positively charged particle in a uniform magnetic field moves in
a circular path in the clockwise direction, parallel to the plane
of the page. In what direction do the magnetic field lines point?
(A)
Out of the page
(B)
Into the page
(C)
To the left
(D)
To the right
(E)
In a clockwise pattern parallel to the plane of the page
3.
What
should one do to maximize the magnitude of the magnetic force acting
on a charged particle moving in a magnetic field?
I. Maximize the strength of the magnetic field
II. Minimize the particle’s velocity
III. Ensure that the particle is moving in the same direction
as the magnetic field lines
(A)
I only
(B)
I and II only
(C)
I and III only
(D)
II and III only
(E)
I, II, and III
4.
What is the magnetic force experienced
by a negatively charged particle of 1.0 C that is moving upward
at a velocity of 2.0 103 m/s
in a magnetic field of strength 4.0 10–4 T, directed
into the page?
(A)
0.8 N to the left
(B)
0.8 N to the right
(C)
2.0 10–7 N
to the left
(D)
2.0 10–7 N
to the right
(E)
5.0 106 N
to the left
5.
A
charged particle is moving in a circular orbit in a magnetic field.
If the strength of the magnetic field doubles, how does the radius
of the particle’s orbit change?
(A)
It is quartered
(B)
It is halved
(C)
It is unchanged
(D)
It is doubled
(E)
It is quadrupled
6.
Which
of the following is not a possible trajectory of a charged particle
in a uniform magnetic field?
(A)
(B)
(C)
(D)
(E)
7.
A positively charged particle
of 2.0 C moves upward into an area where both a magnetic field and
an electric field are acting. The magnetic field has a magnitude
of 4.0 10–4 T
and the electric field has a magnitude of 0.1 N/C. At what velocity
must the particle be moving if it is not deflected when it enters
this area?
(A)
4.0 10–3 m/s
(B)
125 m/s
(C)
250 m/s
(D)
500 m/s
(E)
The particle will be deflected to the left regardless of
its velocity
8.
A
current-carrying wire in a magnetic field is subject to a magnetic
force. If the current in the wire is doubled, what happens to the
magnetic force acting on the wire?
(A)
It is quartered
(B)
It is halved
(C)
It is unchanged
(D)
It is doubled
(E)
It is quadrupled
9.
Two wires carry current in opposite
directions. Which of the following graphs represents the magnetic force
acting on each wire?
(A)
(B)
(C)
(D)
(E)
There is no net force acting on either wire
10.
A current-carrying wire passes
through a uniform magnetic field, as shown above. At which point
is the magnetic field the strongest?
103 m/s
in a magnetic field of strength 4.0 
10–4 T, directed
into the page? 
10–7 N
to the left
10–7 N
to the right
106 N
to the left
10–4 T
and the electric field has a magnitude of 0.1 N/C. At what velocity
must the particle be moving if it is not deflected when it enters
this area? 
10–3 m/s
