Answer
No force is required.
Work Step by Step
The induced emf will not drive a current since there is a break. There will be no magnetic force acting on the slidewire, so no force is needed to keep it moving at constant speed.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 29 - Electromagnetic Induction - Problems - Discussion Questions - Page 981: Q29.11
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