Download Worksheet 14 - Iowa State University

Problem Set 14
Session 3, week 5
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Noah
Phys 222
Lajoie
10/02/16
1. An electron is traveling to the right with a speed of 8.5 x 106 m/s when a magnetic field is
turned on. The strength of the magnetic field is 500 Gauss, and it is directed into the paper.
(a) Describe the path of the electron after the field has been turned on (assuming only
magnetic effects).
(b) What is the magnetic flux through a cube drawn around the electron?
(c) What is the acceleration of the charge in the field?
(d) If possible, find the radius of the electron’s path.
2. An electric field of 1500 V/m and a magnetic field act on an electron moving with a speed of
3000 m/s. If the resultant field is to be zero what should be the strength of the magnetic field (in
Wb/m2)?
3. A water droplet of radius 1 micrometer is charged so that the electric field on its surface is 5.8
mV/meter.
(a) How many electrons does the droplet carry?
(b) How strong a vertical electric field is required to prevent it from falling? (assume no drag
from medium)
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