Answer
The electron beam is traveling parallel (or anti-parallel) to the magnetic field.
Work Step by Step
The magnetic force on the moving charges is zero when it moves parallel to the magnetic field lines. This is stated on page 460.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 24 - Think and Explain - Page 467-468: 58
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