Answer
Yes, magnetic field is increasing.
Work Step by Step
We know that the electric and magnetic fields are mutually related as $E=cB$. Thus, if the electric field is increasing then the magnetic field also increases at the same time.
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 25 - Electromagnetic Waves - Problems and Conceptual Exercises - Page 900: 1
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