(a) An iron ring of relative permeability `mu_(r)` has windings of insulated copper wire
Channel: Doubtnut
Date: 2020-01-03

(a) An iron ring of relative permeability `mu_(r)` 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.