http://www.ck12.org Chapter 14. Magnetism
CHAPTER
(^14) Magnetism
Chapter Outline
14.1 Magnetic Fields
14.2 LORENTZFORCE
14.3 Current and Magnetism
14.4 ELECTROMAGNETICINDUCTION
14.5 Generators and Motors
Introduction
The Big Idea
For static electric charges, the electromagnetic force is manifested by the Coulomb electric force alone. If charges
are moving, an additional force emerges, called magnetism. The 19thcentury realization that electricity and
magnetism are dual aspects of the same force completely changed our understanding of the world we live in.
Insights due to Ampere, Gauss, and Maxwell led to the understanding that moving charges –electric currents
–create magnetic fields. Varying magnetic fields create electric fields. Thus a loop of wire in a changing magnetic
field will have current induced in it. This is calledelectromagnetic induction.Magnetic fields are usually denoted
by the letterBand are measured in Teslas, in honor of the Serbian physicist Nikola Tesla.