How do i explain the relevance of a research question

When I am writing a research paper, or answering questions, I typically find a reliable source and use facts to prove how the said subject is relevant.

Example: I had a paper over how William Shakespeare was relevant/influenced the modern marketing/business world. My claims as to why he was relevant were that he is one of the most well known names in history, and he has built a brand around his name (his playwrights) that can be associated with him. I used a quite from an article where someone had said that Shakespeare has built himself as the biggest brand, whether it was he who built it.

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).

the first, third, and last sentences are correct for plato.