Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 24 - Think and Explain - Page 467-468: 57

Answer

See below.

Work Step by Step

When the ship is manufactured, the iron hull is heated and struck during the lengthy manufacturing process. The heating and the impacts allow the magnetic domains in the hull to align with the Earth's magnetic field, and the hull becomes magnetized. The hull's magnetic field strength and orientation may be of interest for historians, or for later magnetic measurements, and so it is recorded on a plaque.
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