BRAINCAKEElectric Fields
Revision notes for Electric Fields in AQA Physics (7408). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.
- Static ElectricityIf you rub a plastic rod with a dry cloth, the rod becomes charged and will attract small bits of paper.
- Shuttling Ball ExperimentIf you suspend a metal ball by an insulating thread between two vertical plates the ball shuttles back and forth when a high voltage is applied…
- Gold Leaf ElectroscopeA gold leaf electroscope is used to detect charge.
- Electric FieldsCharged objects are surrounded by electric fields.
- Electric field strengthA charged object placed in an electric field will experience a force.
- Lightning ConductorIf air, an insulator, is subjected to a very strong electric field, the air molecules become ionised and become conducting When charge builds up on…
- Electric Field between Two Parallel PlatesThe electric field between two parallel plates is uniform.
- Permittivity of free Space - ε0The electric field around an object is greater when the charge is more concentrated.
- Van de Graaf generatorIf a metal sphere is charged the self-repulsion of charges will result in all the charge residing on the surface of the sphere, which then behaves…
- Electric PotentialThe electric potential at a point in an electric field is the work done per unit charge on a positive test charge when it is moved from infinity to…
- EquipotentialsEquipotentials are line of constant potential.
- Potential gradientThe potential gradient at a point in an electric field is the change of potential per unit change of distance in a given direction.
- The Force between Two Charged ObjectsThe force between two charged objects depends on how close they are to each other.
- Coulombs LawCoulombs law states that the force between two point charges is proportional to the product of their charges and inversely proportional to the…
- Point ChargesA point charge is a hypothetical object of negligible size.
- Electric Field StrengthThe electric field strength is a vector quantity.
- Electric PotentialThe electric field surrounding point charges are radial and is equal to kQ/r at a distance r from Q.