Electric potential energy, or electrostatic potential energy, is a potential energy (measured in joules) that results from conservative Coulomb forces and is associated with the configuration of a particular set of point charges within a defined system.

Electric potential
An electric potential is defined as the amount of electric potential energy that a unitary point electric charge would have if located at any point of space.

Note:
Electric potential is equal to the work done by an electric field in carrying a unit positive charge from infinity to that point.

Electric Potential

The work done in moving a unit positive test charge from infinity to a point inside an electric field is called electric potential. Let's understand why this is the correct answer.

Electric Field

The electric field is a vector quantity that represents the force experienced by a positive test charge placed in the field. It is defined as the force per unit charge and is given by the equation E = F/q, where E is the electric field, F is the force, and q is the charge.

Field Intensity

Field intensity is another term used to describe the electric field. It is defined as the force experienced by a unit positive test charge placed in the field. The field intensity is equal to the electric field.

Potential Difference

Potential difference is the difference in electric potential between two points in an electric field. It is defined as the work done in moving a unit positive test charge from one point to another in the field. The potential difference is given by the equation V = W/q, where V is the potential difference, W is the work done, and q is the charge.

Explanation

When a positive test charge is moved from infinity towards a point inside an electric field, work is done against the electric field force. This work is equal to the change in electric potential energy of the charge. The electric potential is defined as the electric potential energy per unit charge.

As the test charge moves closer to the source of the electric field, the potential energy decreases and becomes more negative. This is because the electric field is doing work on the test charge, converting its potential energy into kinetic energy.

The electric potential at a point inside the field is the electric potential energy per unit charge at that point. It is calculated by dividing the work done in moving the test charge from infinity to that point by the charge itself.

Therefore, the correct answer is option 'A' - electric potential.