Done Monday October 2013 SECTION O
Answer at least ONE question from this section
Define intensity of magnetization and magnetic susceptibility
(03 mar
With the aid of a diagram explain what is meant by hysteresis.
(04 mark
Differentiate between magnetically soft and magnetically hard materials.
(04 mer
(b)
An iron ring of mean diameter 10 cm is uniformly wound with 2000 turns of wire. Whe
current of 0.25 A is passed through the coil a flux density of 0.4 T is set up in the iron.
The magnetising force,
(03 m
The relative permeability of the iron under these conditions.
(02 to
A car aerial is 1.5 m long. Calculate the e. m.f across it when the car is avelling at 30 m
west direction. The horizontal component of the earth's field is 18 T. Assume t​