The expected answers are as follows:

1. (i)  Magnetic field strength is the magnetomotive force per unit length.    Its  symbol is H.

  H =mmf/ l
(ii) Magnetic flux density is the flux magnetic per unit area
Flux density, B = / A

1. (i) Magnetic field strength, H =mmf/ l= NI/l

                                                  H = 1200 = 2000AT/m
                                                           0.6
(ii) Flux density, B = µoH
                             B = (4 x 10-7 x 2000)T = 0.002512 T = 2.51mT

The question was on Electromagnetic Field. It was attempted by many candidates. The performance was less than average.

Many of the candidates who attempted this question did well in the explanation of the magnetic flux density but missed a(i) and the entire (b) parts.