part 1 of 2 Consider the field due to a uniformly charged disk of radius R. and charge Q. Along the symmetry axis at distance z from the cen- ter, the field has been written in following forms. where Eexact = Eo (1 (1-√₁²+2²) Eo (1 - / 1 ) E1 Eo 1 part 2 of 2 Eo = (Q/A) 200 To compare the accuracy of different ap- proximations it is convenient to work with the normalized difference to be specified below. The nth order smallness is charac- terized by e" and € = with e being the smallness parameter. In general the nth or- der term takes the form Ce", where C is some finite constant (e.g 0.1

part 1 of 2 Consider the field due to a uniformly charged disk of radius R. and charge Q. Along the symmetry axis at distance z from the cen- ter, the field has been written in following forms. where Eexact = Eo (1 (1-√₁²+2²) Eo (1 - / 1 ) E1 Eo 1 part 2 of 2 Eo = (Q/A) 200 To compare the accuracy of different ap- proximations it is convenient to work with the normalized difference to be specified below. The nth order smallness is charac- terized by e" and € = with e being the smallness parameter. In general the nth or- der term takes the form Ce", where C is some finite constant (e.g 0.1