Question

During rotation of a body, the position vector is along X axis and force vector is along Y axis. The direction of torque vector is

• A. in the X-Y plane
• B. Along negative Z-axis
• C. Along positive Z-axis
• D. in the X-Z plane

Answer 1

The correct option is C Along positive Z-axis

$\overrightarrow{T}=(\overrightarrow{r}\times \overrightarrow{F})$
$=\left(r\hat{i}\right)\times \left(F\hat{j}\right)$

This yields the direction of the cross product along the unit vector $\hat{k}$
$\therefore$ direction of the $torque$ is along the positive $z-axis$ as per the right hand thumb rule.