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