Torque on Current Loop, Magnetic Dipole

A circular coil of $20$ turns and radius $10 \mathrm{cm}$ is placed in a uniform magnetic field of $0·10\mathrm{T}$ normal to the plane of the coil. If the current in the coil is $5·0 \mathrm{A}$, what is the total torque on the coil?

A uniform magnetic field of $3000 \mathrm{G}$ is established along the positive z-direction. A rectangular loop of sides $10 \mathrm{cm}$ and $5 \mathrm{cm}$ carries a current of $12 \mathrm{A}$. What is the torque on the loop in the different cases shown in the figure? What is the force on each case? Which case corresponds to a stable equilibrium?