PHYSICS · Multi-part · AP · Physics 2: Algebra-based · Electric Force Field and Potential · Electric Force Field and Potential
Problem
A small sphere of mass 2.0g carries a charge of +6.0μC. It is released from rest at point A midway between two large, horizontal, parallel plates that are 4.0cm apart. The upper plate is maintained at an electric potential that is +120V higher than the lower plate.
Answer the following in clear, logically ordered prose. Support each statement with appropriate physical reasoning.
(a) Describe qualitatively how the electric potential energy and the kinetic energy of the sphere change as it moves, after release, until it strikes one of the plates.
(b) The charge on the sphere is now reversed to −6.0μC while all other conditions remain unchanged. Explain how the subsequent motion and the energy changes would differ from the situation in part (a).