Q: A force F = 2.0 N acts on a particle P in the xz-plane. The force F is parallel to x-axis. The particle P (as shown in the figure) is at a distance 3 m and the line joining P with the origin makes angle 30° with the x-axis. The magnitude of torque on P with respect to origin O (in N-m) is
(a) 2
(b) 3
(c) 4
(d) 5
Ans: (b)