SP212/3321&5521
Chapter 28 - Worksheet #3
Question 1: The figure shows four directions for the velocity vector ~v of a positively charged particle
~ (directed out of the page and represented with an encircled
moving through a uniform electric field E
~
dot) and a uniform magnetic field B. (a) Which of the four directions will yield the largest net force
acting on the particle? (b) Of all four directions, which could possibly result in a net force of zero?
Question 2: A positively charged particle moves at constant speed v0 in a straight line through a
region with an electric field pointing up and a uniform magnetic field that points out of the page.
~
E
~v0
+
~
B
(a) An identical particle is then sent along the same pathway, but this second particle is slower than
the first (v < v0 ). In what direction does this second particle bend?
(A) Up
(B) Down
(C) Out of the page
(D) Into the page
(E) It also travels in a straight line
(b) Another particle is then sent along the same pathway at the same speed as the first particle
(v = v0 ), but this third particle has double the charge (q = 2q0 ). In what direction does this third
particle bend?
(A) Up
(B) Down
(C) Out of the page
(D) Into the page
(E) It also travels in a straight line
SP212/3321&5521
Chapter 28 - Worksheet #3
Question 3: A particle with charge q=+250 mC travels at a constant velocity of ~v =(75.0 m/s)î
~
through a region with a uniform magnetic field given by E=(26.0
N/C)k̂ as well as a uniform
magnetic field. The magnetic field is perpendicular to the velocity. What is the magnetic field?
Answer both magnitude and direction.
~
E=(26.0
N/C)k̂
y
+
~v =(75.0 m/s)î
x
+z is out of the page
Question 4: A particle with charge q=−175 mC travels at a constant velocity through a region
~
with a uniform magnetic field given by B=(0.63
T)î as well as a uniform electric field given by
~
E=(68.0 N/C)ĵ. The velocity is perpendicular to the magnetic field. What is the constant velocity?
Answer both magnitude and direction.
~
E=(68.0
N/C)ĵ
y
~
B=(0.63
T)î
x
+z is out of the page