1. The pole faces of a magnet are 4 cm 3 cm and produce a flux of 0.5 mWb. Calculate the flux density.
2. A flux density of 1.8 T exists in an air gap of effective csa 11 cm2. Calculate the value of the flux.
3. If a flux of 5 mWb has a density of 1.25 T, determine the csa of the field.