Electric Charges and Fields
A comb pulled through dry hair picks up scraps of paper without touching them. Electric charge and the field around it explain this pull at a distance. In this chapter you learn the force between charges, how the electric field describes it, how dipoles behave, and how Gauss's law finds the field of a sphere, a wire and a sheet in a few lines. Python plots field lines and sums the force of many charges.
Part of Physics · High School (11–12) (chapter 15)
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Electric Charge and Coulomb's Law
What electric charge is and how it behaves. Conservation and quantisation of charge, Coulomb's law, the force of one charge on another, and the net force when several charges act together.
Electric Field and Dipoles
The electric field as the force on a unit charge. Field lines, the field of a point charge and of a ring or a line of charge, the electric dipole in its own field and in an outside field.