$($a$)$

At what angle $$ is the torque on a current loop $86\mathrm{.}0\%$ of maximum?

$$

$($b$)$

At what angle $$ is the torque on a current loop $51\mathrm{.}0\%$ of maximum?

$$

$($c$)$

At what angle $$ is the torque on a current loop $12\mathrm{.}0\%$ of maximum?