strength of a magnet
strength of an electromagnet
magnetisation remained in an iron bar on withdrawal of the magnetising force
the conductivity of a magnetic material for the magnetic lines of force
Carbon steel
Platinum cobalt
ALNICO-V
All of these
flux
type of material
type of magnetising force
nothing
reluctance
resistance
reactance
conductance
increasing and decreasing the number of turns of the coil
using an exciting coil with number of tappings
varying the current through the exciting coil
varying the core position of the exciting coil