Passing a ____ through lines of flux causes a current to flow in the ____.

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Moving a conductor through magnetic field lines induces an electromotive force in that conductor, and if the conductor forms a closed circuit, this emf drives a current through it. The magnetic field exerts a force on the free charges inside the conductor as they move with the conductor, pushing them along the length of the conductor and creating a potential difference. An insulator wouldn’t have free charge carriers to carry current, so it wouldn’t produce a usable current in this situation. A wire is a type of conductor, but the general principle is that the current flows in the conductor itself, not in the surrounding field or in an insulating material.