A neutral solid aluminum sphere is held fixed on an insulating stand
PHYSICS · Single correct · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields
Problem
A neutral solid aluminum sphere is held fixed on an insulating stand. A negatively charged plastic rod is slowly brought close to, but does not touch, the left side of the sphere, and is then removed to a distant location. Which of the following identifies the net charge of the sphere after the rod has been removed?
(a) Positive, because electrons were repelled off the sphere and into the surrounding air.
(b) Impossible to determine without knowing whether the sphere was grounded.
(c) Zero, because no electrons were transferred to or from the sphere during the process.
(d) Negative, because electrons migrated toward the side near the rod and remained there after the rod was removed.