Torque on a solenoid

A cylindrical solenoid of length $10 \, \text{cm}$ and cross-sectional area $9 \, \text{cm}^2$ makes $800$ turns per meter with a current of $50 \, \text{mA}$ flowing through it. If the solenoid is placed in a magnetic field of magnitude $0.5 \, \text{mT}$ such that the long axis of the solenoid is perpendicular to the field, determine the total torque on the solenoid in $\text{N} \cdot \text{m}$ .