Chronos000 said:Specifically I am not sure if there is no electric field at r>b as if you use gauss' law, the total charge within the gaussian surface is 0.
An electric field is a physical field that surrounds electrically charged particles and exerts a force on other charged particles within the field. It is a fundamental concept in physics and is used to explain the behavior of electrically charged objects.
Concentric shells are a set of spherical surfaces with the same center point, similar to the layers of an onion. In relation to electric fields, they refer to a configuration of charged particles where they are arranged in spherical shells with the same center point.
An electric field is created between concentric shells when there is a difference in charge between the shells. This creates an imbalance of electric charges, resulting in an electric field between the shells.
The direction of the electric field between concentric shells is always radial, meaning it points directly away from the center of the shells. This is because the electric field is created by the difference in charge between the shells, which is concentrated at the center point.
The strength of the electric field between concentric shells decreases as the distance from the center increases. This is due to the inverse square law, which states that the strength of an electric field is inversely proportional to the square of the distance from the source of the field.