In a fusion reaction, a major problem related to causing the nuclei to fuse into a single nucleus is the

Explanation:

A fusion reaction is a reaction in which two or more small nuclei combine together to form a larger nuclei.

As it is known that a nucleus contains protons and neutrons. So when nuclei of two atoms combine together then there will be repulsion between the protons due to the presence of like charges. As neutrons have no charge so there will be no attraction or repulsion between neutrons of two nuclei.

Thus, we can conclude that in a fusion reaction, a major problem related to causing the nuclei to fuse into a single nucleus is the repulsion of nuclei.

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