The Figure Shows the Orientation of a Rectangular Loop Consisting $40 \hat { \mathbf { i } }$

Multiple Choice

The figure shows the orientation of a rectangular loop consisting of 80 closely wrapped turns each carrying a current I.The magnetic field in the region is ( $40 \hat { \mathbf { i } }$ ) mT.The loop can turn about the y axis.If $\theta$ = 30 $\degree$ ,a = 0.40 m,b = 0.30 m,and I = 8.0 A,what is the magnitude of the torque exerted on the loop?

A) 2.5 N .m
B) 1.5 N. m
C) 3.1 N . m
D) 2.7 N . m
E) 0.34 N . m