lecture goals

• Learn about two more 1/r² forces, electricity and magnetism.
• Learn who Coulomb, Ampere, and Faraday were.
• Learn that electricity comes from charges at rest.
• Learn that magnetism comes from moving electric charges, called electric currents.
• Learn what a dipole is.
• Define fields as lines of force, learn the rules for field lines, and see demonstrations of electric and magnetic dipole fields.
• Learn the difference between action at a distance as a way to transmit forces, and causal forces.