Electromagnetism Resource

3. Electric and Magnetic Fields

This chapter introduces some of the electromagnetic theory associated with electricity.

Some key points from this chapter:

  • There are two types of charge: positive and negative. Both charges create electric fields.
  • Static (non-moving) charges generate electric fields. These electric fields exert forces on charged particles.
  • Electric field forces can be attractive or repulsive.
  • Like charges repel, unlike charges attract.
  • Magnetic fields are generated by moving charged particles.
  • Magnetic fields are generated and can be held indefinitely by certain chemical elements such as iron, nickel and cobalt.