A Circular Loop of Wire of Radius 0

Multiple Choice

A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field?

A) zero
B) 0.41 m∙N
C) 0.47 m∙N
D) 0.52 m∙N
E) 0.59 m∙N