PHYS 102 Chapter Notes - Chapter 27: South Magnetic Pole, Magnetic Flux, Electric Flux
7 Mar 2017
School
Department
Course
Professor
Document Summary
Magnetic forces are at the heart of electric motors, microwave ovens, loudspeakers, computer printers, and desk drives. Permanent magnets attract unmagnetized iron objects and also attract or repel other magnets such as compasses. Fundamental nature of magnetism is the interaction of moving electric charges. Electric force arises in two stages: a charge produces an electric field in the space around it, a second charge responds to this field. Magnetic forces arise in two stages: a moving charge or a collection of moving charges produces a magnetic field, a second current or moving charge responds to this magnetic field, and so experiences a magnetic force. Permanent magnets are found to exert forces on each other as well as on pieces of iron that were not magnetized: when an iron rod is brought in contact with a natural magnet, the rod also becomes magnetized. The interactions of permanent magnets and compass needles were described in terms of magnetic poles.
