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WorksheetsHmh Magnetic Forces
Total questions: 9
Worksheet time: 5mins
Name
Class
Date
1.
Units of a magnetic field might be:
a)
C×m/s
b)
C×s/m
c)
C/kg
d)
kg/C×s
2.
The direction of the magnetic field in a certain region of space is determined by firing a test charge into the region with its velocity in various directions in different trials. The field direction is:
a)
one of the directions of the velocity when the magnetic force is zero
b)
the direction of the velocity when the magnetic force is a maximum
c)
the direction of the magnetic force
d)
perpendicular to the velocity when the magnetic force is zero
3.
An electron is moving north in a region where the magnetic field is south. The magnetic force exerted on the electron is:
a)
zero
b)
up
c)
north
d)
south
4.
A magnetic field exerts a force on a charged particle:
a)
always
b)
never
c)
if the particle is moving across the field lines
d)
if the particle is moving along the field lines
5.
A proton (charge e), traveling perpendicular to a magnetic field, experiences the same force as an alpha particle (charge 2e) which is also traveling perpendicular to the same field. The ratio of their speeds, vproton/valpha is:
a)
0.5
b)
1
c)
2
d)
4
6.
An electron travels due north through a vacuum in a region of uniform magnetic field that is also directed due north. It will:
a)
be unaffected by the field
b)
speed up
c)
slow down
d)
follow a right-handed corkscrew path
7.
An electron and a proton are both initially moving with the same speed and in the same direction at 90˚ to the same uniform magnetic field. They experience magnetic forces, which are initially:
a)
identical
b)
equal in magnitude but opposite in direction
c)
in the same direction and differing in magnitude by a factor of 1840
d)
in opposite directions and differing in magnitude by a factor of 1840
8.
A beam of electrons is sent horizontally down the axis of a tube to strike a fluorescent screen at the end of the tube. On the way, the electrons encounter a magnetic field directed vertically downward. The spot on the screen will therefore be deflected:
a)
upward
b)
downward
c)
to the right as seen from the electron source
d)
to the left as seen from the electron source
9.
An electron (charge = –1.6 ´ 10–19 C) is moving at 3.0 ´ 105 m/s in the positive x direction. A magnetic field of 0.80 T is in the positive z direction. The magnetic force on the electron is:
a)
0 N
b)
4.5 ´ 10–14 N in the positive z direction
c)
4.5 ´ 10–14 N in the negative z direction
d)
4.5 ´ 10–14 N in the positive y direction
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