$6\mathrm{.}7$ A $5-H$ inductor changes its current by $3$ A in $0\mathrm{.}2$ s $.$ The voltage produced at the terminals of the inductor is:

$($a$)75$ V

$($b$)8\mathrm{.}888$ V

$($c$)3$ V

$($d$)1\mathrm{.}2$ V