A Single Circular Loop of Radius 1

A single circular loop of radius 1.00 m carries a current of 10.0 mA. It is placed in a uniform magnetic field of magnitude 0.500 T that is directed parallel to the plane of the loop as suggested in the figure. What is the magnitude of the torque exerted on the loop by the magnetic field?

A) 1.57 × 10^-2 N . m
B) 3.14 × 10^-2 N . m
C) 6.28 × 10^-2 N . m
D) 9.28 × 10^-2 N . m
E) zero N . m