You decide to levitate a paperclip (m = 1 g). For that, you generate a vertically oriented (from the ground upward) uniform electric field E = 200 V/m. Then you add an electric charge to the paperclip so that the electric force on the paperclip would cancel gravity.

(a) What is the magnitude of the charge?

(b) What is its sign?

(c) How many elementary charges constitute this charge?