ABSTRACT
At the end of this chapter you should be able to:
• appreciate some applications of magnets • describe the magnetic field around a permanent magnet • state the laws of magnetic attraction and repulsion for two magnets in close proximity • define magnetic flux, , and magnetic flux density, B , and state their units • perform simple calculations involving B= /A • define magnetomotive force, Fm, and magnetic field strength, H , and state their units • perform simple calculations involving Fm =NI and H =NI/ l • define permeability, distinguishing between μ0, μr and μ • understand the B-H curves for different magnetic materials • appreciate typical values of μr • perform calculations involving B=μ0μrH • define reluctance, S, and state its units • perform calculations involving
S = m.m.f .
