Thirty Turns of Wire Are Tightly Wrapped into a Coil

Thirty turns of wire are tightly wrapped into a coil around a round pencil that has a diameter of 6.0 mm.The pencil is then placed into a uniform B = 8.0 T magnetic field as shown in the figure.If a 4.0-A current is present in the coil of wire,what is the magnitude of the torque on the pencil?

A) 4.6 * 10^-2 Nm
B) 7.8 * 10^-2 Nm
C) 1.4 * 10^-2 Nm
D) 2.4 * 10^-2 Nm
E) 18 Nm