$5.$ A circular loop of wire having a radius of $8\mathrm{.}0$ cm carries a current of $0\mathrm{.}20$ A$.$ A unit vector parallel to the dipole moment ~$$ of the loop is given by $3545.$ If the loop is located in a magnetic field given by B~ $=0\mathrm{.}25+0\mathrm{.}3$k T$,$ find $($a$)$ the magnitude and $2022$ University of Rochester $3$ PHY$122$P Module $7$ direction of the torque on the loop, and $($b$)$ the magnetic potential energy of the loop. Assume the same zero energy configuration assumed in Section $28-8$ of the book