BRAINCAKEElectric Fields
Revision notes for Electric Fields in OCR Physics A (H556). 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 generatorIn the van der Graaf generator, a rubber belt rubs against a felt pad and carries the charge created up to a metal dome.
- 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.