What causes permanent magnetism on a vessel?

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Question 1 of 2707066636ee928f7522a1c5192a0

Question 1 of 27070

What causes permanent magnetism on a vessel?

🔍 Key Concepts

• Hard iron vs. soft iron magnetism on a ship • When and where in a ship’s life permanent magnetism is mainly acquired • The role of the earth’s magnetic field during shipbuilding and major repairs

💭 Think About

• Ask yourself: Which type of iron (hard or soft) keeps its magnetism for a long time, even after the original magnetic influence is removed? • Think about when the ship’s structure is most exposed, in one fixed orientation, to the earth’s magnetic field (for example, during construction or major overhaul). • Which options describe effects that would be more temporary (induced) rather than long‑lasting (permanent) magnetism?

✅ Before You Answer

• Identify which answer choices are clearly referring to soft iron (more associated with induced, changeable magnetism). • Identify which answer choice involves hard iron and a long, continuous exposure to the earth’s field. • Before choosing, ask: "Does this cause a lasting magnetic field in the hull, or only while the influencing field/equipment is operating?"

Question 1 of 27070

What causes permanent magnetism on a vessel?

The earth's magnetic field affecting the ship's hard iron during construction

The operation of electrical equipment and generators on board ship

The vertical component of the earth's magnetic field acting on the vertical soft iron

The horizontal component of the earth's magnetic field acting on the horizontal soft iron

Question 1 / 2707066636ee928f7522a1c5192a0

Question 1 of 2707066636ee928f7522a1c5192a0

What causes permanent magnetism on a vessel?

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Question 1 of 27070

What causes permanent magnetism on a vessel?