Question

question: like, or similar, poles of two magnets ____ each other.

Explanation:

In the study of magnetism (a subfield of Physics, which is part of Natural Science), a fundamental principle is that like poles of magnets (e.g., north - north or south - south) exert a repulsive force on each other, while opposite poles attract. So based on this physical principle, the word that fits in the blank is "repel".

Answer:

repel