Chapter 18 - Electric fields - Part 03 скачать в хорошем качестве

Chapter 18 - Electric fields - Part 03

Learning outcomes By the end of this topic, you will be able to: 18.1 Electric fields and field lines Understand that an electric field is an example of a field of force and define electric field as force per unit positive charge. Recall and use F = qE for the force on a charge in an electric field. Represent an electric field by means of field lines. 18.2 Uniform electric fields Recall and use E = ΔV/d to calculate the field strength of the uniform field between charged parallel plates. Describe the effect of a uniform electric field on the motion of charged particles. 18.3 Electric force between point charges Understand that, for a point outside a spherical conductor, the charge on the sphere may be considered to be a point charge at its center. Recall and use Coulomb’s law F = Q₁Q₂ / (4πε₀r²) for the force between two point charges in free space. 18.4 Electric field of a point charge Recall and use E = Q / (4πε₀r²) for the electric field strength due to a point charge in free space. 18.5 Electric potential Define the electric potential at a point as the work done per unit positive charge in bringing a small test charge from infinity to the point. Recall and use the fact that the electric field strength at a point is equal to the negative of the potential gradient at that point. Use V = Q / (4πε₀r) for the electric potential in the field due to a point charge. Understand how the concept of electric potential leads to the electric potential energy of two point charges and use Eₚ = Qq / (4πε₀r).