JEE Advanced Model Paper 1 with solutions for online practice

Along straight wire is arranged along the symmetry axis of a toroidal coil ofrectangulai· cross - section, whose dimensions are given in the figure. Thenumber of tmns on the coil is N, and relative pe1meability of the smi-oundingmedium is unity. If the current i = im cos ωt flows along the straight wire, then the amplitude of the emf induced in this coil is

µ0hωimN

xπ

log (

b

a

) then x =