I assume you'll be doing the MA in Arabic.
"How is learning English as a Foreign Language affected by the use of Arabic?". or
"How does the use of Arabic affect the learning of English as a Foreign Language?"
Yes, this is a linguistics topic, specifically psycho/neuro linguistics, which deals with the acquisition of language. I'd suggest you look for books or articles with the terms "linguistics" and "language acquisition" or "acquisition of language" in them.
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