Question 665Navigation General

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.