8
Electromagnetism
OBJECTIVES
In this chapter you will learn about:
- The magnetic field about a permanent magnet
- State the laws of magnetic attraction and repulsion for two magnets in close proximity
- Define magnetic terms such as magnetic flux ɸ, magnetic flux density B, and magnetic field strength or magnetizing force Η and state their units
- Define permeability, distinguishing between μ0, μr and μ
- Understand the B–H curve for different materials
- Perform calculations on magnetic circuits
- Compare electrical and magnetic quantities
- Understand that magnetic fields are produced by electric currents
- Apply the screw rule to determine the direction of electric field
- Recognize that the magnetic field about a solenoid is similar to that of a magnet ...
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