Unit 4B: Electromagnetism

Unit Learning Goals:

By the end of this unit, students will….

• visualize field lines and understand how matter accounts for, and systems behave in a magnetic field.

• understand the relationship between Oerstead principles, Faraday's Law, Electromagnetic Induction and Lenz Law, and predict the behaviour of a given system based on this understanding and the application of Right-Hand Rules.

• perform experiments to determine the properties of electromagnetic fields around a wire and the creation of current from changing magnetic fields.

• demonstrate an understanding of the properties of magnetic fields, the principles of current and electron flow, and the operation of selected technologies that use these properties and principles to produce and transmit electrical energy. 

TOPICS

 Magnetism and Domain Theory

• Ferromagnetism

• Paramagnetism

• Diamagnetism

Oerstead's Discovery

• Right Hand Rules #1 / #2 (RHR)

Geomagnetism and Heliomagnetism

Solenoids

Electromagnets - Properties (B = µNI)

The Motor Principle and Applications

• • Aurora Borealis

  • Speakers

  • Cathode Ray Tubes ('Retro' TVs)

  • The Rail Gun

  • DC and AC Motors

Induction and Lenz Law (EMF = ΦNv)

Induction Applications

• • Eddy Tube (aka "The Mystery Tube of Physics")

  • The "Magic" Levitating Ring

  • Magnetic Braking

  • Induction Heating

  • Transformers

  • Others: GFCI, Guitar Pickups, Microphones, Toroid Choke, HDD (Magnetic Information Storage)

Generators (AC and DC)