Q: Figure shows a lamina in XY-plane. Two axes Z and Z’ pass perpendicular to its plane. A force F acts in the plane of lamina at point P as shown. Which of the following are true? (The point P is closer to Z’-axis that the Z-axis)
(a) Torque τ caused by F about Z –axis is along $-\hat{k}$
(b) Torque τ’ caused by F about Z’-axis is along $-\hat{k}$
(c) Torque τ caused by F about z-axis is greater in magnitude than that about z-axis
(d) Total torque is given by = τ + τ’
Ans: (b) & (c)