![]() ![]() The electric field strength E at a point is the force experienced per unit positive charge on a point charge placed at that point. Unlike gravitational forces, which are always attractive, electric forces can be attractive or repulsive. Electric charges create an electric field in the space around them. An electric field exists in a region of space in which a stationary charge experiences a force. Gravitational fields are concerned with masses, whereas electric fields are concerned with charges. Rubbed balloon sticking to wall Lightning Photocopying Laser printing Flue-ash precipitation Spray Painting (f) recognise the similarities of, and differences between, electric fields and gravitational fields. (e) recall and use E = V/d for the magnitude of the uniform electric field strength between charged parallel plates. ![]() (d) recall and use E = kQ / r 2 for the electric field strength of a point charge. (c) recall and use Coulomb’s law for point charges in a vacuum in the form F = kQ1Q2 / r2, where k =1 / 4πε0. ![]() (b) use field lines to represent an electric field. 3 Electric Fields Content Concept of an electric fieldįorce between point charges Electric field of a point charge Uniform electric fields Learning Outcomes Candidates should be able to: (a) understand an electric field as an example of a field of force and define, recall and use electric field strength as force per unit positive charge. ![]()
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