PHYSICS · Subjective · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential
Problem
An insulated metal sphere, initially neutral, is touched by a rod carrying −8.0μC of charge; the charge spreads uniformly over the sphere. While the rod remains in contact, the sphere is connected to ground until its net charge becomes zero. The grounding wire is removed first, followed by the rod. State the direction of electron flow during the grounding step and identify the final net charge of the sphere after the rod is removed, justifying your answer in terms of charge transfer among the rod, sphere, and Earth.