PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential
Problem
A negatively charged rod is brought near, but does not touch, a small metal sphere. Consider two cases:
I. The sphere is isolated (not connected to anything).
II. While the rod is nearby, the sphere is briefly connected to Earth (grounded) and then disconnected before the rod is removed.
After the rod is far away, which statement correctly describes the net charge on the sphere in each case?
(a) Case I: negative ; Case II: zero
(b) Case I: zero ; Case II: negative
(c) Case I: zero ; Case II: positive
(d) Case I: positive ; Case II: zero