Question 665Navigation General
70% to passAt the magnetic equator there is no induced magnetism in the vertical soft iron because _______________.
A
the intercardinal headings have less than 1° error
B
there is no vertical component of the Earth's magnetic field
C
the quadrantal error is 0°
D
the lines of force cross the equator on a 0°-180° alignment
AI Explanation
The correct answer is B) there is no vertical component of the Earth's magnetic field. At the magnetic equator, the Earth's magnetic field is entirely horizontal, with no vertical component. This means that there is no induced magnetism in vertical soft iron objects, such as the compass's binnacle, because there is no vertical field to induce magnetism. The other answer choices are incorrect because they do not directly address the lack of a vertical magnetic field component at the magnetic equator.
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