6.2 Electric Fields
6.2.1 Point and spherical charges
Learners should be able to demonstrate and apply their knowledge and understanding of:
(a) electric fields are due to charges
(b) modelling a uniformly charged sphere as a point charge at its centre
(c) electric field lines to map electric fields
(d) electric field strength; E =.F/Q
6.2.2 Coulomb's Law
Learners should be able to demonstrate and apply their knowledge and understanding of:
(c) similarities and differences between the gravitational field of a point mass and the electric field of a point charge
(d) the concept of electric fields as being one of a number of forms of field giving rise to a force.
6.2.3 Uniform Electric Field
Learners should be able to demonstrate and apply their knowledge and understanding of:
(a) uniform electric field strength; E= V/d
(c) motion of charged particles in a uniform electric field.
This is a moment when your suvat knowledge comes back. There is a constant force applied in one direction on a charged particle in an electric field. This means that they accelerate at a constant rate. This is exactly the same as a projectile moving in a gravitational field.
6.2.4 Electric potential and energy
Learners should be able to demonstrate and apply their knowledge and understanding of:
(a) electric potential at a point as the work done in bringing unit positive charge from infinity to the point; electric potential is zero at infinity
(d) force–distance graph for a point or spherical charge; work done is area under graph