Question

a. Define the following terms:

i.                   Permeability ii.          Magnetic field strength iii.     Magnetic flux density

[3 marks]

b.

            i.         Determine the inductance of a coil 0.01m long, 4 turns, cross-sectional area of

0. Im² with a permeability of the core material is 0.25x10-3H/m.

[4 marks]

ii.                If a current of 3A flow for 5ms what is the induce voltage.

[2 marks]

c. Calculate the flux density produced by a magnetizing force of 2000 At/m in a steel of relative permeability 400.