Question 664Navigation General70% to pass
Permanent magnetism is caused by _______________.
AI Explanation
The correct answer is D) the earth's magnetic field affecting the ship's hard iron during construction.
Permanent magnetism in a ship is caused by the earth's magnetic field acting on the ship's hard iron components during the construction process. As the ship is being built, the hard iron parts of the vessel become magnetized by the earth's magnetic field, resulting in a permanent magnetic field within the ship. This permanent magnetism is separate from the temporary magnetism induced by the earth's field acting on the ship's soft iron components.
The other answer choices are incorrect because they do not accurately describe the primary cause of permanent magnetism on a ship, which is the interaction between the earth's magnetic field and the ship's hard iron during construction.
Related Questions
#662 Magnets are placed in horizontal trays in the compass binnacle to compensate for the _______________.#663 Magnets in the binnacles of magnetic compasses are used to reduce the effect of _______________.#665 At the magnetic equator there is no induced magnetism in the vertical soft iron because _______________.#666 The greatest directive force is exerted on the magnetic compass when the _______________.#667 The magnetic compass magnets are acted on by the horizontal component of the Earth's total magnetic force. This magnetic force is GREATEST at the _______________.