SP212/3321&5521
Chapter 28 - Worksheet #1
Question 1: (Homework Question 28.1) The figure below shows three sets of vectors representing the
velocity of a charged particle, the magnetic field, and the magnetic force. (a) For each of the three
situations, are the shown vectors physically reasonable? (b) For any situation that is physically
reasonable, is the particle positively charged or negatively charged?
Question 2: A point charge is moving with ~v =(350 m/s)î in a region with a uniform magnetic field
B=2.50 T, oriented 150◦ counter-clockwise from the positive x-axis. (a) Suppose that the charge
is q=−2.50µC. What is the magnetic force acting on this particle? Answer both magnitude and
direction. (b) Suppose that the charge is q=+2.50µC. What is the magnetic force acting on this
particle? Answer both magnitude and direction.
y
B=2.5 T
150◦
x
+z is out of the page
v=350 m/s
SP212/3321&5521
Chapter 28 - Worksheet #1
Question 3: A particle with charge q=+2.40µC is moving with velocity ~v =(175 m/s)ĵ through a
~ = (1.25î + 2.12ĵ − 3.75k̂) T. What is the magnetic force acting on the particle
magnetic field of B
in vector form?
Question 4: A particle with charge q=−3.60µC is moving with a velocity of ~v = (460î + 830k̂) m/s
~ = Bz k̂). The magnetic force acting on the particle is
in a magnetic field that is along the z-axis (B
F~B =(0.0113 N)ĵ. What is Bz ?