question

(a) an iron ring of relative permeability  has windings of insulated copper wire of n turns per metre. when the current in the windings is i, find the expression for the magnetic field in the ring.
(b) the susceptibility of a magnetic material is 0·9853. identify the type of magnetic material. draw the modification of the field pattern on keeping a piece of this material in a uniform magnetic field.

 

 

 

 

 

 

575