What is the basic principle of the magnetic compass?()

A . Magnetic materials of the same polarity repel each other and those of opposite polarity attract B . The Earth's magnetic lines of force are parallel to the surface of the Earth C . Magnetic meridians connect points of equal magnetic variation D . The compass needle(s) will,when properly compensated,lie parallel to the isogonic lines of the Earth

时间:2022-10-26 21:17:14 所属题库:磁罗经与陀螺罗经的使用题库

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