Electromagnetism
Practice Test
1.
A proton moves at a speed of 7.9×10
3
m/s as it passes through and is perpendicular to a 0.45-T uniform magnetic field. Find the radius of the circular path.
a.
3.4×10
-3
m
b.
1.0×10
-4
m/s
c.
1.8×10
-4
m
d.
5.6×10
-7
m
Hint
2.
The oscillations of a coil and capacitor circuit can be compared to a _________.
a.
pendulum
b.
merry-go-round
c.
parabolic path of a ball
d.
ship in orbit
Hint
3.
An electron of mass 9.11×10
-31
kg moves through a cathode-ray tube with a speed of 2.6×10
6
m/s across and perpendicular to a magnetic field of 4.2×10
-2
T. The electric field is turned off. What is the radius of the circular path followed by the electron?
a.
8.1×10
-1
m
b.
3.5×10
4
m
c.
3.5×10
-4
m
d.
4.6×10
3
m
Hint
4.
Energy carried in the form of electromagnetic waves is frequently called __________.
a.
oscillating rays
b.
electromagnetic radiation
c.
terminal energy
d.
electromotive force
Hint
