They provide a source of electrons to be released by the photoelectric effect, and They provide a path through which released electrons move to form an electric current.
The answer is B. They provide a source of electrons to be released by the photoelectric effect, and D.They provide a path through which released electrons move to form an electric current.
If a positive charge enters a magnetic field at 90 degrees the charge is deflected in a circular path by a force that acts perpendicular to it in line with Flemings right-hand rule
to derive the radius of the path of the charge we apply
