Answer
It will decrease.
Work Step by Step
When coil 2 is rotated as described, none of the magnetic field lines produced by coil 1 go through it, so the mutual inductance becomes zero.
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 30 - Inductance - Problems - Discussion Questions - Page 1012: Q30.3
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