The expected answers were:
(a)(i)     Magnetic flux density is the amount of magnetic flux per unit area of a
            section, perpendicular to the direction of flux.
                        B =  Φ
                                A
            where   B  =  magnetic flux density in Tesla (T)
                        Φ  =  magnetic flux in webers (Wb)
                        A  =  area in square metres (m2)

The S. I. unit of magnetic flux density in weber per square metre (Wb/m2)
(ii)        Magnetic flux is the group of magnetic field lines emitted outward from
the north pole of a magnet.  The symbol for magnetic flux is Φ (phi).

The S. I. unit of magnetic flux is the weber (Wb)

(b)        E  =  1.375v
            L  =  0.25cm = 2.5 x 10-3m     
            v   =  5ms-1

            E   = Blv
: .         B   = E
                     Lv

           B    =          1.375
                    
                            2.5 x 10-3 x 5
                      
                          B    =  110 Wb/m2

This question was on magnetic field.  Many candidates could not just give the definitions of B and Φ correctly. 

Many candidates did not convert from centimetres to metres thus getting the final answer wrong.