# Electric Fields

#### Chapter 12 - Electric Fields

The second field covered in the GCE A Levels is the electric field. This video introduces us to the idea of electric field lines and discusses some of the features of field theory.

We can study electric fields in space quantitatively using Coulomb’s Laws. In the GCE A Levels, we must be able to compute the electric field strength at any point in space and this video will discuss this.

In the GCE A Levels, we need to know Coulomb’s Law, which describes the electric force between two charged objects. This video discusses this concept and how it relates seamlessly to electric field strength at a point.

Electric potential is similar to electric field strengths as they describe what happens at a point in space. In the GCE A Levels, we must understand how to compute the electric potential at a point, and also explain why the values are negative or positive depending on the charge creating the field at that point. This video will also explore what happens to the potential at a point when multiple charged particles are involved.

The electric potential energy of an object at a point is easily computed if we know the electric potential at that point. In the GCE A Levels, we must also understand the concept of equipotential lines. This video will explain this and how we can use equipotential lines to study the energy changes of a charged object moving around in space.

In the GCE A Levels, we must understand that the electric field strength is equal to the negative electric potential at a point. This video will discuss this using the concept of equipotential lines to illustrate this relationship.

In the GCE A Levels, you may be asked to plot or interpret graphs of quantities related to electric fields or potentials. This video will explain how this is done in detail, and also briefly mentions the relationship between electric force and electric potential energy.

In the GCE A Levels, we have to study uniform electric fields, which is formed in the region between two long parallel plates with a potential difference applied across them. This video will discuss how to compute the electric field strength and electric potential at any point between these plates.

Uniform electric fields are used in several ways. For the GCE A Levels, we typically apply them in particle accelerators, where we apply the conservation of energy to compute the velocity of a charged particle passing through a direction normal to the plates. We may also use uniform electric fields in charged particle deflection, where the charged particle passes parallel to the plates. Here, we may use kinematics to study the path of the particle.