Final answer:
The electric potential at a point y due to a charge q is determined by the formula V = kQ/r. This concept is crucial when discussing the force exerted on a charge in an electric field, given by F = qE.
Step-by-step explanation:
The question pertains to the concept of electric potential at a point due to a charge q and how it interacts within an electric field. The electric potential V of a point charge is given by the equation V = kQ/r, where k is Coulomb's constant, Q is the charge creating the potential, and r is the distance from the charge. If we consider other charges in the vicinity, such as a charge moving from one point to another in an electric field, we can also discuss work done on the charge and electric field strength using the same fundamental concepts of electrostatics.
For a charge q moving in an electric field, the force exerted on it is described by F = qE, where E is the electric field strength. This fundamental relation allows us to calculate the work done on the charge as it moves through the electric field. Furthermore, using the concept of electric potential, we can relate it to the work done per unit charge.