$58.(8$ points$)$: At what axial distance will a magnetic dipole of dipole moment $=50\mathrm{.}0$ Am$2$ produce

a field of $50\mathrm{.}0$ T$?$

$($a$)22\mathrm{.}5$ cm

$($b$)44\mathrm{.}7$ cm

$($c$)50\mathrm{.}3$ cm

$($d$)58\mathrm{.}5$ cm

$($e$)89\mathrm{.}2$ cm