Potential difference, also known as voltage, is the difference in electric potential between two points in an electric field. It is measured in volts (V).
Va-Vb represents the potential difference between two points, Va and Vb, in an electric field. It is calculated by subtracting the potential at point Vb from the potential at point Va.
A 4.3 nC particle refers to a particle with a charge of 4.3 nanocoulombs (nC). Coulombs is the unit of electric charge, and 1 nC is equivalent to 1 billionth of a coulomb.
The 225 N/C field represents the strength of the electric field at a certain point. It is measured in newtons per coulomb (N/C) and indicates the force that would be exerted on a charge placed in that field.
The potential difference for a particle in an electric field can be calculated using the formula V = Ed, where V is the potential difference, E is the electric field strength, and d is the distance between the two points in the field. The potential difference is directly proportional to the electric field strength and the distance between the points.