University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 32 - Electromagnetic Waves - Problems - Discussion Questions - Page 1072: Q32.8


The new amplitude would be $B\sqrt{2}$.

Work Step by Step

Equation 32.29 can be used to give the intensity in terms of the magnetic field amplitude. $$I=\frac{E_{max}B_{max}}{2\mu_o}$$ We use the fact that $ E_{max}= cB_{max}$ $$I=\frac{cB_{max}^2}{2\mu_o}$$ If the intensity is doubled, the magnetic field amplitude is multiplied by $\sqrt{2}$.
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