A small uncharged metallic sphere is suspended by an insulating thread inside a hollow
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential
Problem
A small uncharged metallic sphere is suspended by an insulating thread inside a hollow, isolated conducting shell that is also uncharged. A positively charged rod is brought close to the outside of the shell without touching it. While the rod remains in place, the shell is momentarily connected to ground, and then the grounding connection is removed. Finally, the charged rod is taken far away.
Which of the following describes the final net charges on the shell and on the enclosed sphere?
(a) Shell: positive Sphere: 0
(b) Shell: 0 Sphere: 0
(c) Shell: negative Sphere: 0
(d) Shell: negative Sphere: positive