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Electrical Technology, Volume 1 by S. P. Bali

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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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