(a) Define the following terms as applied to magnetic circuit:
(i) magnetic field;
(ii) magnetic flux.
(b) A conductor of length 0.4 m moves with a velocity of 2 m/s at an angle to a magnetic field of flux density 0.9 T. If an e.m.f. of 0.5 V was induced in it, calculate the angle of movement of the conductor relative to the magnetic field.