A point electrical field is a type of electric field that is created by a single point charge. This means that the electric field lines radiate outwards from the point charge in all directions.
The strength of a point electrical field is calculated using Coulomb's Law, which states that the strength of the electric field is directly proportional to the magnitude of the point charge and inversely proportional to the square of the distance from the point charge.
A point electrical field is created by a single point charge, while a uniform electrical field is created by multiple charges that are evenly distributed. Additionally, a point electrical field has a strength that varies with distance from the point charge, while a uniform electrical field has a constant strength throughout.
Yes, a point electrical field can exist in a vacuum. In fact, it is often used as a model to simplify calculations in vacuum devices such as electron microscopes and particle accelerators.
A point electrical field can be shielded or blocked by placing a grounded metal object between the point charge and the area where the electric field is not desired. This will cause the electric field lines to terminate on the metal object instead of continuing on to the desired area.