A material that produces magnetic field are called magnets. Magnetic poles refers to the ends of a magnet where the forces are strongest.
What are magnetic poles?
Magnetic poles are the regions at each end of a magnet where the external magnetic field is strongest.
A bar magnet suspended in the Earth's magnetic field orients itself north-south. A north magnetic pole is the north-seeking pole of such a magnet or any similar pole.
Thus, the correct option is D.
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