Self$-$Practice $3$

The magnetic circuit shown is made of a material having relative permeability of $2000.$

The central limb is wound with $1000$ turns and has an air gap of length of $2$mm$.$ The

side limb air gap is $8$mm$.$ Calculate the current required to set up a flux of $2\mathrm{.}6$mWb in

the central limb$.$ Mean lengths of various sections are as follows: AB$=24$cm$,$ACDB$=$

AFGHEB $=60$cm$.$ Cross sectional area of the structure is $10$cm$^(2).$