Which statement best describes magnetic fields?

A. They must have only positive charges.
B. They are often found in negative insulators.
C. They need a conductor.
D. They have north and south magnetic poles.



Answer :

Final answer:

Magnetic fields always consist of North and South poles occurring in pairs, and magnetic monopoles do not exist.


Explanation:

Magnetic fields always occur in pairs of North and South poles. This is a fundamental property of magnets, from the smallest scale of atoms to larger scale objects like the Earth and sunspots. Unlike electric charges, magnetic monopoles do not exist, meaning isolated North or South poles cannot be found.


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