How can the permanent magnetism of a vessel...

Question 1 / 2707066636ee928f7522a1c519e17

Question 1 of 2707066636ee928f7522a1c519e17

How can the permanent magnetism of a vessel change in strength?

Question 1 of 27070

How can the permanent magnetism of a vessel change in strength?

🔍 Key Concepts

• Difference between permanent magnetism and induced magnetism in a steel hull • What kinds of actions can physically alter the steel structure or its magnetic domains • Which factors only change the direction of the ship’s magnetic field versus its strength

💭 Think About

• Ask yourself: which option involves actually changing the steel of the ship itself, not just how it is oriented? • Which choices mainly affect the ship’s magnetic environment (outside field) rather than the magnetism built into the hull? • Think about what must happen to the metal for the permanent magnetism to increase, decrease, or be redistributed.

✅ Before You Answer

• Identify which answer, if any, involves heating, hammering, or stressing the steel structure. • Separate effects that change compass deviation with heading (often induced magnetism) from those that change the permanent magnetism locked into the hull. • Verify which factors are known to require a new compass adjustment or calibration after shipyard work.

Question 1 of 27070

How can the permanent magnetism of a vessel change in strength?

Changes in the vessel's heading

Welding and major structural repair

The nature of the cargo being carried

Geographical location of vessel