Suppose You Electrically Charge a Transparency by Rubbing It, and Then

Multiple Choice

Suppose you electrically charge a transparency by rubbing it, and then hang the transparency, at rest, by a string in the center of a room. Except for the transparency and string, the room is totally evacuated of all matter. Neglecting any influences from outside the room, what kinds of forces would then be found at places inside the room but away from the transparency-- for instance, at a point near a corner of the room?

A) an electric force only
B) a magnetic force only
C) Both an electric and magnetic force
D) No forces at all, because there is no electric or magnetic field at such a point
E) No forces at all, because there is no material object at such a point